The latest Page builder release includes the following improvement:
Notifications now alert users when a fallback is set, helping them understand why certain page content appears, or why some fields cannot be edited.
The latest Page builder release also resolves these issues:
Editable fallback fields: Fields with fallback values were incorrectly uneditable after creating a new language version. This is now fixed.
Canvas refresh focus: Previously, refreshing the canvas shifted focus from the Page Content panel to the canvas, disrupting input. Focus now remains stable.
Multilist search duplicates: Multilist with search fields now shows one entry per item, regardless of language versions, preventing duplicates and also matching Content Editor behavior.