i registered a block type in wordpress 5.4 as described in these description: https://www.advancedcustomfields.com/resources/blocks/
Everything worked fine. With an update to wordpress 5.5 the block is no longer available. A message in the backend appears:
Your website doesn’t support the block.
this error occurs because we are using the plugin “WP All Import Pro” in version 4.6.1. This causes a jquery migrate issue (https://wordpress.org/support/topic/wordpress-5-5-compatibility/). After deactivating wp all import pro everything is working fine and our block types available again.
Hey @ppi Thanks for following up with your findings! I had the same issue and thought it was a function I had added, you saved me some good time there! buy you coffee if I could 🙂