Advanced Custom Fields Pro 6.4.0.1

New - Options Pages created in the admin UI can now be assigned as child pages for any top-level menu item
New - Added a "Title Placeholder" setting to ACF Post Types which filters the "Add title" text when editing posts
Enhancement - ACF PRO will now warn when it can’t update due to PHP version incompatibilities
Enhancement - ACF PRO will now work correctly with WordPress automatic updates
Enhancement - The internal ACF Blocks template attribute parser function parseNodeAttr can now be shortcut with the new acf_blocks_parse_node_attr filter.
Enhancement - Removed legacy code for supporting WordPress versions under 5.8
Fix - The "Menu Position" setting is no longer hidden for child options pages
Fix - The tabs for the "Advanced" settings in Post Types and Taxonomies are now rendered inside a wrapper div
Fix - Options pages will no longer display as a child page in the list view when set to a top level page after previously being a child
Fix - Conflict with Elementor CSS breaking the ACF PRO banner
Fix - Errors generated during the block editor’s savePost function will no longer be caught and ignored by ACF

New - ACF now requires WordPress version 5.8 or newer, and PHP 7.0 or newer. View the release post for more information
New - Bidirectional Relationships now supported for Relationship, Post Object, User and Taxonomy fields. View the release post for more information
New - Options Pages can now be registered and managed by the admin UI in ACF PRO
New - Link to the product feedback board added to the plugin footer
Enhancement - ACF JSON now supports multiple save locations (props Freddy Leitner)
Enhancement - ACF Post Types and Taxonomies can now be duplicated
Enhancement - The filename for JSON files can now be customized with the acf/json/save_file_name filter
Fix - REST updates of fields with choices containing integer or mixed keys now behave correctly
Fix - Using the block_type_metadata_settings PHP filter to add usesContext values no longer breaks ACF blocks
Fix - Notice to import post types/taxonomies from CPTUI no longer flashes on page load
Fix - Various buttons for fields in blocks now display correctly
Fix - The settings for the DateTime field are no longer cut off when nested in several fields in the field group editor
Fix - The newline added to the end of JSON files will now use PHP_EOL to detect the correct newline character with a filter acf/json/eof_newline to alter it.
i18n - Updated French and Portuguese translations (Thanks to pedro-mendonca and maximebj)

Security Fix - This release resolves a stored XSS vulnerability in admin screens with ACF post type and taxonomy labels