Fix JSON literal value version 1 check.

Author: dlongley

lib/expand.js

@@ -769,9 +769,9 @@ async function _expandObject({
 
   // @value must not be an object or an array (unless framing) or if @type is
   // @json
-  if('@value' in element) {
-    const value = element['@value'];
-    if(element['@type'] === '@json' && _processingMode(activeCtx, 1.1)) {
+  if('@value' in expandedParent) {
+    const value = expandedParent['@value'];
+    if(expandedParent['@type'] === '@json' && _processingMode(activeCtx, 1.1)) {
       // allow any value, to be verified when the object is fully expanded and
       // the @type is @json.
     } else if((_isObject(value) || _isArray(value)) && !options.isFrame) {