I also infrequently, yet frustratingly often find that copy and paste between semi-remote windows just seem to stop working for a while. As a specific example,

I also infrequently, yet frustratingly often find that copy and paste between semi-remote windows just seem to stop working for a while. As a specific example, I can be on my main system with a hardline connection to remote desktop a meter away from me and also on the main system have a window ssh-ed into a locally hosted docker image. I sometimes, but not always find that copy from the remote desktop and paste to the ssh terminal just does not work with symtoms suggesting there are multiple buffers and paste is using the wrong one. I know the copy puts the correct value in the buffer as the "fix" I use is to paste into an editor running on my local system, then recopy the value and paste into the ssh terminal.