useDocumentForm hook undefined in livePreview

[bratvanov]

Describe the Bug

The useDocumentForm hook added in #9869 is not available in livePreview.

Link to the code that reproduces this issue

https://github.com/bratvanov/payloadcms-usedocumentform-livepreview-undefined/commit/a9c00f80e3c2747c531ecaddb157ea07a4dcdb65

Reproduction Steps

Related to: #9869

1. Add a custom block with useDocumentForm to the Lexical editor in a livePreview-enabled collection.

When in "Edit" mode, the document form data is being logged as expected:

Parent Document Fields: {title: {…}, content: {…}, updatedAt: {…}, createdAt: {…}}

However, after clicking on "Live Preview" in the admin panel, then useDocumentForm becomes undefined:

Parent Document Fields: undefined

CC: @AlessioGr

Which area(s) are affected? (Select all that apply)

plugin: richtext-lexical

Environment Info

Node: 22.12.0
payload: 3.24.0
next: 15.1.5

[bratvanov]

This issue has been fixed as a side-effect of #12860, where the live preview is now in the root and not on a separate URL, so I'm closing it as resolved.

[github-actions]

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Please open a new issue if this issue persists with any additional detail.