I just installed clipmon, and I am finding that there is an issue when using it with the editor Geany. I noticed that some copy (or cut) operations are not working, so after trying to copy, the clipboard still contains the previous clipboard contents.
It's easiest to replicate for me when trying to do a copy (or cut) after first switching to Geany from another app. I also see it if I do several copy/cut operations quickly one after another.
When this occurs, I see the message
We already own Clipboard, escaping.