Advanced Custom Fields Pro 6.3.11

* Enhancement - Options Pages registered in the UI can now be duplicated
* Fix - ACF Block validation now correctly validates Repeater, Group, and Flexible Content fields
* Fix - ACF Block validation now correctly validates when a field is using a non-default return type
* Fix - Fields moved between field groups now correctly updates both JSON files
* Fix - Icon Picker fields now render correctly when using left-aligned labels
* Fix - Icon Picker fields no longer renders tabs if only one tab is selected for display
* Fix - Icon Picker fields no longer crash the post editor if no icon picker tabs are selected for displayed
* Fix - True/False field now better handles longer On/Off labels
* Fix - Select2 results loaded by AJAX for multi-select Taxonomy fields no longer double encode HTML entities

* Fix: A possible fatal error no longer occurs in the new site health functionality for ACF PRO users
* Fix: A possible undefined index error no longer occurs in ACF Blocks for ACF PRO users

* Security Fix - ACF Blocks no longer allow render templates, or render or asset callbacks to be overridden in the block's attributes. For full information, please read [the release blog post](https://www.advancedcustomfields.com/blog/acf-pro-6-2-10-security-release/)