Hi Lexy,
unfortunately, I could only fix this by working on documents, which are not located inside of a cryptomator-mounted cloud folder. Thus, dragging them out of the cloud folder to my local hard drive, working on them and reupploading them afterwards.
It seems like working on documents (which are located in cloud folders) “through” Cryptomator is generally buggy. See here and here for example.
Have you tried changing the volume type from FUSE-T to WebDAV or FUSE?
If you find a solution, please let us know 