Greetings gentlemen!
Such a question is ripe.
Transplanting the plant into a larger pot, I wanted to bury it deeper, but I was afraid to bury the cotyledons.
How critical is it and can they be buried at all?
It's not critical. 😎 Personally, I would cut the cotyledons 2 days earlier so that the wounds can dry, and then plant it deeper. But you can also plant it deeper like that. The plant will drop the leaves before they rot in the substrate.