diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index cc78635071b..84633de6ce1 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -18,5 +18,6 @@
 
 - [ ] _The PR has a short but descriptive title, suitable for a changelog_
 - [ ] _Tests added / updated (if applicable)_
+- [ ] _❗Changes to a redux slice have a corresponding migration_
 - [ ] _Documentation added / updated (if applicable)_
 - [ ] _Updated `What's New` copy (if doing a release after this PR)_
diff --git a/invokeai/frontend/web/src/app/store/store.ts b/invokeai/frontend/web/src/app/store/store.ts
index 40cd78a3e45..12fcfa5a406 100644
--- a/invokeai/frontend/web/src/app/store/store.ts
+++ b/invokeai/frontend/web/src/app/store/store.ts
@@ -18,7 +18,8 @@ import { addModelsLoadedListener } from 'app/store/middleware/listenerMiddleware
 import { addSetDefaultSettingsListener } from 'app/store/middleware/listenerMiddleware/listeners/setDefaultSettings';
 import { addSocketConnectedEventListener } from 'app/store/middleware/listenerMiddleware/listeners/socketConnected';
 import { deepClone } from 'common/util/deepClone';
-import { keys, mergeWith, omit, pick } from 'es-toolkit/compat';
+import { merge } from 'es-toolkit';
+import { omit, pick } from 'es-toolkit/compat';
 import { changeBoardModalSliceConfig } from 'features/changeBoardModal/store/slice';
 import { canvasSettingsSliceConfig } from 'features/controlLayers/store/canvasSettingsSlice';
 import { canvasSliceConfig } from 'features/controlLayers/store/canvasSlice';
@@ -133,16 +134,14 @@ const unserialize: UnserializeFunction = (data, key) => {
     const initialState = getInitialState();
     const parsed = JSON.parse(data);
 
-    // strip out old keys
-    const stripped = pick(deepClone(parsed), keys(initialState));
-    /*
-     * Merge in initial state as default values, covering any missing keys. You might be tempted to use _.defaultsDeep,
-     * but that merges arrays by index and partial objects by key. Using an identity function as the customizer results
-     * in behaviour like defaultsDeep, but doesn't overwrite any values that are not undefined in the migrated state.
-     */
-    const unPersistDenylisted = mergeWith(stripped, initialState, (objVal) => objVal);
-    // run (additive) migrations
-    const migrated = persistConfig.migrate(unPersistDenylisted);
+    // We need to inject non-persisted values from initial state into the rehydrated state. These values always are
+    // required to be in the state, but won't be in the persisted data. Build an object that consists of only these
+    // values, then merge it with the rehydrated state.
+    const nonPersistedSubsetOfState = pick(initialState, persistConfig.persistDenylist ?? []);
+    const stateToMigrate = merge(deepClone(parsed), nonPersistedSubsetOfState);
+
+    // Run migrations to bring old state up to date with the current version.
+    const migrated = persistConfig.migrate(stateToMigrate);
 
     log.debug(
       {
diff --git a/invokeai/frontend/web/src/features/controlLayers/store/paramsSlice.ts b/invokeai/frontend/web/src/features/controlLayers/store/paramsSlice.ts
index 232f88b0364..e6b88fd5427 100644
--- a/invokeai/frontend/web/src/features/controlLayers/store/paramsSlice.ts
+++ b/invokeai/frontend/web/src/features/controlLayers/store/paramsSlice.ts
@@ -4,6 +4,7 @@ import type { RootState } from 'app/store/store';
 import type { SliceConfig } from 'app/store/types';
 import { deepClone } from 'common/util/deepClone';
 import { roundDownToMultiple, roundToMultiple } from 'common/util/roundDownToMultiple';
+import { isPlainObject } from 'es-toolkit';
 import { clamp } from 'es-toolkit/compat';
 import type { AspectRatioID, ParamsState, RgbaColor } from 'features/controlLayers/store/types';
 import {
@@ -52,6 +53,7 @@ import type {
 import { getGridSize, getIsSizeOptimal, getOptimalDimension } from 'features/parameters/util/optimalDimension';
 import { modelConfigsAdapterSelectors, selectModelConfigsQuery } from 'services/api/endpoints/models';
 import { isNonRefinerMainModelConfig } from 'services/api/types';
+import { assert } from 'tsafe';
 
 const slice = createSlice({
   name: 'params',
@@ -122,8 +124,8 @@ const slice = createSlice({
         state.dimensions.aspectRatio.isLocked = true;
         state.dimensions.aspectRatio.value = 1;
         state.dimensions.aspectRatio.id = '1:1';
-        state.dimensions.rect.width = 1024;
-        state.dimensions.rect.height = 1024;
+        state.dimensions.width = 1024;
+        state.dimensions.height = 1024;
       }
 
       applyClipSkip(state, model, state.clipSkip);
@@ -247,26 +249,26 @@ const slice = createSlice({
     sizeRecalled: (state, action: PayloadAction<{ width: number; height: number }>) => {
       const { width, height } = action.payload;
       const gridSize = getGridSize(state.model?.base);
-      state.dimensions.rect.width = Math.max(roundDownToMultiple(width, gridSize), 64);
-      state.dimensions.rect.height = Math.max(roundDownToMultiple(height, gridSize), 64);
-      state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+      state.dimensions.width = Math.max(roundDownToMultiple(width, gridSize), 64);
+      state.dimensions.height = Math.max(roundDownToMultiple(height, gridSize), 64);
+      state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
       state.dimensions.aspectRatio.id = 'Free';
       state.dimensions.aspectRatio.isLocked = true;
     },
     widthChanged: (state, action: PayloadAction<{ width: number; updateAspectRatio?: boolean; clamp?: boolean }>) => {
       const { width, updateAspectRatio, clamp } = action.payload;
       const gridSize = getGridSize(state.model?.base);
-      state.dimensions.rect.width = clamp ? Math.max(roundDownToMultiple(width, gridSize), 64) : width;
+      state.dimensions.width = clamp ? Math.max(roundDownToMultiple(width, gridSize), 64) : width;
 
       if (state.dimensions.aspectRatio.isLocked) {
-        state.dimensions.rect.height = roundToMultiple(
-          state.dimensions.rect.width / state.dimensions.aspectRatio.value,
+        state.dimensions.height = roundToMultiple(
+          state.dimensions.width / state.dimensions.aspectRatio.value,
           gridSize
         );
       }
 
       if (updateAspectRatio || !state.dimensions.aspectRatio.isLocked) {
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.id = 'Free';
         state.dimensions.aspectRatio.isLocked = false;
       }
@@ -274,17 +276,17 @@ const slice = createSlice({
     heightChanged: (state, action: PayloadAction<{ height: number; updateAspectRatio?: boolean; clamp?: boolean }>) => {
       const { height, updateAspectRatio, clamp } = action.payload;
       const gridSize = getGridSize(state.model?.base);
-      state.dimensions.rect.height = clamp ? Math.max(roundDownToMultiple(height, gridSize), 64) : height;
+      state.dimensions.height = clamp ? Math.max(roundDownToMultiple(height, gridSize), 64) : height;
 
       if (state.dimensions.aspectRatio.isLocked) {
-        state.dimensions.rect.width = roundToMultiple(
-          state.dimensions.rect.height * state.dimensions.aspectRatio.value,
+        state.dimensions.width = roundToMultiple(
+          state.dimensions.height * state.dimensions.aspectRatio.value,
           gridSize
         );
       }
 
       if (updateAspectRatio || !state.dimensions.aspectRatio.isLocked) {
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.id = 'Free';
         state.dimensions.aspectRatio.isLocked = false;
       }
@@ -299,55 +301,55 @@ const slice = createSlice({
         state.dimensions.aspectRatio.isLocked = false;
       } else if ((state.model?.base === 'imagen3' || state.model?.base === 'imagen4') && isImagenAspectRatioID(id)) {
         const { width, height } = IMAGEN_ASPECT_RATIOS[id];
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.isLocked = true;
       } else if (state.model?.base === 'chatgpt-4o' && isChatGPT4oAspectRatioID(id)) {
         const { width, height } = CHATGPT_ASPECT_RATIOS[id];
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.isLocked = true;
       } else if (state.model?.base === 'gemini-2.5' && isGemini2_5AspectRatioID(id)) {
         const { width, height } = GEMINI_2_5_ASPECT_RATIOS[id];
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.isLocked = true;
       } else if (state.model?.base === 'flux-kontext' && isFluxKontextAspectRatioID(id)) {
         const { width, height } = FLUX_KONTEXT_ASPECT_RATIOS[id];
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
-        state.dimensions.aspectRatio.value = state.dimensions.rect.width / state.dimensions.rect.height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
+        state.dimensions.aspectRatio.value = state.dimensions.width / state.dimensions.height;
         state.dimensions.aspectRatio.isLocked = true;
       } else {
         state.dimensions.aspectRatio.isLocked = true;
         state.dimensions.aspectRatio.value = ASPECT_RATIO_MAP[id].ratio;
         const { width, height } = calculateNewSize(
           state.dimensions.aspectRatio.value,
-          state.dimensions.rect.width * state.dimensions.rect.height,
+          state.dimensions.width * state.dimensions.height,
           state.model?.base
         );
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
       }
     },
     dimensionsSwapped: (state) => {
       state.dimensions.aspectRatio.value = 1 / state.dimensions.aspectRatio.value;
       if (state.dimensions.aspectRatio.id === 'Free') {
-        const newWidth = state.dimensions.rect.height;
-        const newHeight = state.dimensions.rect.width;
-        state.dimensions.rect.width = newWidth;
-        state.dimensions.rect.height = newHeight;
+        const newWidth = state.dimensions.height;
+        const newHeight = state.dimensions.width;
+        state.dimensions.width = newWidth;
+        state.dimensions.height = newHeight;
       } else {
         const { width, height } = calculateNewSize(
           state.dimensions.aspectRatio.value,
-          state.dimensions.rect.width * state.dimensions.rect.height,
+          state.dimensions.width * state.dimensions.height,
           state.model?.base
         );
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
         state.dimensions.aspectRatio.id = ASPECT_RATIO_MAP[state.dimensions.aspectRatio.id].inverseID;
       }
     },
@@ -359,25 +361,25 @@ const slice = createSlice({
           optimalDimension * optimalDimension,
           state.model?.base
         );
-        state.dimensions.rect.width = width;
-        state.dimensions.rect.height = height;
+        state.dimensions.width = width;
+        state.dimensions.height = height;
       } else {
         state.dimensions.aspectRatio = deepClone(DEFAULT_ASPECT_RATIO_CONFIG);
-        state.dimensions.rect.width = optimalDimension;
-        state.dimensions.rect.height = optimalDimension;
+        state.dimensions.width = optimalDimension;
+        state.dimensions.height = optimalDimension;
       }
     },
     syncedToOptimalDimension: (state) => {
       const optimalDimension = getOptimalDimension(state.model?.base);
 
-      if (!getIsSizeOptimal(state.dimensions.rect.width, state.dimensions.rect.height, state.model?.base)) {
+      if (!getIsSizeOptimal(state.dimensions.width, state.dimensions.height, state.model?.base)) {
         const bboxDims = calculateNewSize(
           state.dimensions.aspectRatio.value,
           optimalDimension * optimalDimension,
           state.model?.base
         );
-        state.dimensions.rect.width = bboxDims.width;
-        state.dimensions.rect.height = bboxDims.height;
+        state.dimensions.width = bboxDims.width;
+        state.dimensions.height = bboxDims.height;
       }
     },
     paramsReset: (state) => resetState(state),
@@ -488,7 +490,18 @@ export const paramsSliceConfig: SliceConfig<typeof slice> = {
   schema: zParamsState,
   getInitialState: getInitialParamsState,
   persistConfig: {
-    migrate: (state) => zParamsState.parse(state),
+    migrate: (state) => {
+      assert(isPlainObject(state));
+
+      if (!('_version' in state)) {
+        // v0 -> v1, add _version and remove x/y from dimensions, lifting width/height to top level
+        state._version = 1;
+        state.dimensions.width = state.dimensions.rect.width;
+        state.dimensions.height = state.dimensions.rect.height;
+      }
+
+      return zParamsState.parse(state);
+    },
   },
 };
 
@@ -600,8 +613,8 @@ export const selectRefinerScheduler = createParamsSelector((params) => params.re
 export const selectRefinerStart = createParamsSelector((params) => params.refinerStart);
 export const selectRefinerSteps = createParamsSelector((params) => params.refinerSteps);
 
-export const selectWidth = createParamsSelector((params) => params.dimensions.rect.width);
-export const selectHeight = createParamsSelector((params) => params.dimensions.rect.height);
+export const selectWidth = createParamsSelector((params) => params.dimensions.width);
+export const selectHeight = createParamsSelector((params) => params.dimensions.height);
 export const selectAspectRatioID = createParamsSelector((params) => params.dimensions.aspectRatio.id);
 export const selectAspectRatioValue = createParamsSelector((params) => params.dimensions.aspectRatio.value);
 export const selectAspectRatioIsLocked = createParamsSelector((params) => params.dimensions.aspectRatio.isLocked);
diff --git a/invokeai/frontend/web/src/features/controlLayers/store/types.ts b/invokeai/frontend/web/src/features/controlLayers/store/types.ts
index 23b1b968861..36381441f00 100644
--- a/invokeai/frontend/web/src/features/controlLayers/store/types.ts
+++ b/invokeai/frontend/web/src/features/controlLayers/store/types.ts
@@ -558,18 +558,13 @@ const zBboxState = z.object({
 });
 
 const zDimensionsState = z.object({
-  // TODO(psyche): There is no concept of x/y coords for the dimensions state here... It's just width and height.
-  // Remove the extraneous data.
-  rect: z.object({
-    x: z.number().int(),
-    y: z.number().int(),
-    width: zParameterImageDimension,
-    height: zParameterImageDimension,
-  }),
+  width: zParameterImageDimension,
+  height: zParameterImageDimension,
   aspectRatio: zAspectRatioConfig,
 });
 
 export const zParamsState = z.object({
+  _version: z.literal(1),
   maskBlur: z.number(),
   maskBlurMethod: zParameterMaskBlurMethod,
   canvasCoherenceMode: zParameterCanvasCoherenceMode,
@@ -617,6 +612,7 @@ export const zParamsState = z.object({
 });
 export type ParamsState = z.infer<typeof zParamsState>;
 export const getInitialParamsState = (): ParamsState => ({
+  _version: 1,
   maskBlur: 16,
   maskBlurMethod: 'box',
   canvasCoherenceMode: 'Gaussian Blur',
@@ -661,7 +657,8 @@ export const getInitialParamsState = (): ParamsState => ({
   clipGEmbedModel: null,
   controlLora: null,
   dimensions: {
-    rect: { x: 0, y: 0, width: 512, height: 512 },
+    width: 512,
+    height: 512,
     aspectRatio: deepClone(DEFAULT_ASPECT_RATIO_CONFIG),
   },
 });
diff --git a/invokeai/frontend/web/src/features/nodes/util/graph/graphBuilderUtils.ts b/invokeai/frontend/web/src/features/nodes/util/graph/graphBuilderUtils.ts
index 78ddb6232fc..a98faea93a5 100644
--- a/invokeai/frontend/web/src/features/nodes/util/graph/graphBuilderUtils.ts
+++ b/invokeai/frontend/web/src/features/nodes/util/graph/graphBuilderUtils.ts
@@ -130,8 +130,7 @@ export const getOriginalAndScaledSizesForTextToImage = (state: RootState) => {
     const scaledSize = ['auto', 'manual'].includes(canvas.bbox.scaleMethod) ? canvas.bbox.scaledSize : originalSize;
     return { originalSize, scaledSize, aspectRatio };
   } else if (tab === 'generate') {
-    const { rect, aspectRatio } = params.dimensions;
-    const { width, height } = rect;
+    const { width, height, aspectRatio } = params.dimensions;
     return {
       originalSize: { width, height },
       scaledSize: { width, height },