Prevent block editor from adding overlap by default to columns

When I create a new columns block, the editor adds the overlap option by default, so the class “is-style-twentytwentyone-columns-overlap” gets added.

I do not want this, but I can’t seem to get rid of it although the class is not in my inc/block-patterns.php file.

I’m using a created child theme for Twenty Twenty One theme.

I also tried to unregister the block style with custom js file:

wp.domReady(() => {     wp.blocks.unregisterBlockStyle('core/columns', 'twentytwentyone-columns-overlap'); } ); 

Here I can not see the option anymore to choose it, but when creating new columns it’s still added by default.

Any idea on how to get the columns without overlap by default please?