Everything KDE from git master on Fedora 34. STEPS TO REPRODUCE 1. Open a native Wayland app 2. Open an XWayland app 3. Select something with the mouse in one app 4. Focus the other app and middle-click OBSERVED RESULT Nothing happens EXPECTED RESULT Text selected in the first app is pasted
This is a dupe, the code is simply missing. Blocked on doing some refactoring. (I would find the original, but as it's you I'm sure you can find it)
*** This bug has been marked as a duplicate of bug 422426 ***
Patrick beat me to it!