AdvancedCustomFields/acf 6.6.2

Advanced Custom Fields v6.6.2

on GitHub

Release Date 29th October 2025

• Enhancement - Added a new convert_field_name_to_lowercase JS filter to allow uppercase letters in ACF field names
• Enhancement - The form for V3 Blocks can now be optionally hidden from the sidebar via a new hideFieldsInSidebar setting in block.json
• Enhancement - V3 Blocks now display an "Open Expanded Editor" button in the sidebar for easier access to the full edit form
• Fix - The buttons to reorder ACF metaboxes are no longer hidden for metaboxes in the block editor sidebar
• Fix - V3 Blocks now display a fallback message when the block preview can't be rendered due to invalid HTML being used in field values
• Fix - V3 Blocks no longer show a loading spinner when preloaded
• Fix - V3 Blocks now save default field values even if the block wasn't interacted with before saving
• Fix - Pressing CMD/CTRL + Z no longer causes the fields to disappear in V3 Blocks
• Fix - The form for V3 Blocks now opens on the left side in RTL languages