Could you provide ACF Pro copy for testing? Send zip to the support email. I guarantee that it will be installed it only locally and for testing purpose.
ACF Pro uses to add its meta boxes not ‘add_metaboxes’ action as WordPress recommends, but ‘admin_head’ action. This was a reason why URE Pro missed them.
Thanks for your help in discovering this issue.
I included the fix for it to the upcoming version 4.23.3. I plan to publish it this week.