Hello,
I was looking into the source of a degradation in my block editor experience, where all padding and margins are removed. I discovered some documentation that there’s a WordPress compatibility fallback mechanism that removes the iframe and the padding/margins when a plugin is using an older version of the block API. It appears that TNP registers at least one block (tnp/minimal) with no API version — which defaults to 1. Are you able to upgrade to version 2 or 3 of the block API?