For anyone reading this thread, you can also create a link to your liking by using the filter described in this thread.

For example, here is what I did. (I did not use ACF to register my field, just PHP.)

add_filter( 'meta_field_block_get_block_content', function ( $content, $attributes, $block, $post_id ) {
    $field_name = $attributes['fieldName'] ?? '';
    
    if ( $field_name === '_my_url_field') {
      $content = '<a href="' . $content . '">' . $content . '</a>';
    }
    
    return $content;
  }, 10, 4);

Of course, replace _my_url_field with your own field’s name.