Steps to reproduce:
Cryptomator 1.14.1, MacOS 14.7, fuse-t 1.0.42.
Create a vault with many small files. In my case, 10GB and 10k files. From the Finder, delete the folder containing 10k files.
After a few seconds you will get the dialog offering you to disconnect the vault.
Note that this bug doesn’t happen if you delete the files slowly, one file every one second. That’s how I’ve done it for a year or so, with a script.
This bug might also happen when moving many files at once inside the vault. And also when moving many files at once out of the vault. But mass deleting is the simplest way to reproduce.