In my case it’s mixed up now. It is still described as in my first post above. Now I have specified files in the status window of one device which are deleted and no longer exist. It is not clear, where this information comes from. Also a --reset-deltas can not solve this problem.
I can’t say exactly when the problem begun, since there are already version jumps between. However, I think that with v1.16.0 this state has arise itself at some point and cannot be remedied.