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  • Just to add that even though my ACF block was registered with underscores in the name, these had to be replaced with hyphens in the allowed_block_types() function for it to work!

    add_filter( 'allowed_block_types', 'custom_allowed_block_types' );
    function custom_allowed_block_types( $allowed_blocks ) {
        return array(

    Hope this helps someone 🙂