Issue #3620663: Document the serialization requirement for cached forms. (!28) · Merge requests · project / multivalue_form_element

The add and remove buttons rebuild the form over AJAX, so any object holding the form has to survive the form cache. Note what that means for forms embedded in block plugins, including through Layout Builder.

#ai-assisted

Closes #3620663

Issue #3620663: Document the serialization requirement for cached forms.

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