Why does ‘Attempt Block Recovery’ happen a lot randomly when editing? And how do I prevent/fix it?

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Using the ***Heiwa*** theme, and I presume it’s…updated/supported in 2023? (cant see any reviews)
Support has no support as there are never replies either.
Sometimes my site is fine when saved (e.g last night)
Other times when editing (this morning), usually the ‘text/paragraph’s blocks’ will mention:

***This block contains unexpected or invalid content.***

***Attempt Block Recovery***

When I recover it, it doesnt work most of the time. Or if I re-add said text, it is fine.
What can I do to fix this so it doesnt happen in the future and what am I editing wrong?
All I’m doing really is resizing the block(/padding) and changing font appearance.

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