Diarium version: 2.8.16
OS + version: iOS 15.2
As seen in the screenshot, there was a warning about sync, but the keyboard overlaps both options to choose from.

Prerequisites:
- WebDAV auto sync
- I guess the db has to be slightly out of sync, as the message makes me believe. The message reads: "The local database has a younger change date than the remote database, but is smaller than this one. Are you sure you want to upload the local database?" (Automated translation from iOS). I cannot remember if it really was out of sync besides the text I added minutes before the message.
Detailed steps:
- I wrote some text in Diarium, then tapped on the calendar entry (can be seen in green on the screenshot)
- Back in Diarium this happened as on the screenshot. I was unable to get rid of the keyboard and couldn't tap anything on the warning message.
- Only force quitting Diarium helped