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Gutenberg button removed on save if its empty

I have buttons with no text in my design which has icons designed in :before of the a tag.

It was working fine with the WP 5.5, but now I have updated in live and when I save any page it removes all those buttons.

I understand that because it is empty WP removes it on save. Is there a way that I can skip a block or skip this removing block stuff because most of my blocks have empty buttons and live site cannot be edited because it removes all empty buttons.