Advanced Custom Fields Pro 6.4.0.1

Fix - Fixed several Select2.js conflicts with other plugins
Fix - Fixed an issue where block name sanitization could change valid block names containing double hyphens
Fix - Fixed an issue where blocks with integer IDs could fail to load example field data

Fix - Fixed a bug when accessing field values for options pages registered with a custom post_id

Enhancement - Added "acf/admin/license_key_constant_message" filter to allow changing of the "Your license key is defined in wp-config.php" message
Fix - Added warning for when get_field() or similar functions are called before ACF has initialized. Learn more
Fix - Fixed fields not appearing on user REST API endpoints if their field group location was set to a user form other than "all"
Fix - Fixed warning in REST API if a custom field type did not have the "show_in_rest" property
Fix - Fixed an error that could occur if value of WYSIWYG field was not a string