Advanced Custom Fields Pro 6.2.9

Fix - Fixed bug causing multiple image fields to not validate files properly
Fix - Fixed bug preventing case-sensitive HTML tags from working in blocks
Fix - Fixed bug causing JSX-enabled blocks to improperly remove whitespace in preview
Fix - Fixed bug causing text fields to remove HTML entities when editing saved fields
Fix - Fixed deprecated jQuery notices on "Add Field Group" page

Fix - Fixed PHP warnings logged due to incorrect parameter type for add_menu_page()/add_submenu_page()
Fix - Fixed bug causing WYSIWYG field to not keep line breaks
Fix - Fixed bug causing Email field to incorrectly invalidate emails with unicode characters
Fix - Fixed bug causing file type validation to fail in some cases
Fix - Fixed bug where newly uploaded or selected images do not contain custom preview size data

* Enhancement - Added 'position' setting compatibility for Options Page submenus.
* Enhancement - Visually highlight "High" metabox area when dragging metaboxes.
* Fix - Fixed compatibility issue between Block matrix alignment setting and the latest version of Gutenberg (10.6).
* Fix - Fixed bug breaking WYSIWYG field after reordering a child block via the block's toolbar up/down buttons.
* Fix - Added missing "readonly" and "disabled" attributes to DateTime and Time picker fields.
* Fix - Fixed bug incorrectly validating Email field values containing special characters.
* Fix - Fixed missing "dashicons" asset dependency from front-end forms.
* Fix - Fixed bug causing Review JSON diff modal to appear with narrow column since WP 5.7.
* Dev - Added label elements to Repeater, Flexible Content and Clone field's table header titles.
* Dev - Added new `ACF_EXPERIMENTAL_ESC_HTML` constant. [Read more](https://github.com/AdvancedCustomFields/acf/issues/500)