Thank you for the info!
This sounds plausible and could be the reason why it’s not reproducible anymore.
Sooo, we actually reproduced it in the meantime by “simulating” the issue. We basically renamed the ciphertext names directly and forced the cleartext to be encoded with NFD.
We’re going to update Sanitizer so that it can solve this specific issue, too. And we have to find a solution for Cryptomator itself as well but this will take more time.
I’ll let you know when the updated version of Sanitizer is available. It’s probably going to be version 0.15.