There does not seem to be a bug report yet, the closest I could find is this one:
https://bugs.kde.org/show_bug.cgi?id=462076
Edit: filed a bug report here: 483405 – Top bar gets rendered at the wrong window after screen being turned off
There does not seem to be a bug report yet, the closest I could find is this one:
https://bugs.kde.org/show_bug.cgi?id=462076
Edit: filed a bug report here: 483405 – Top bar gets rendered at the wrong window after screen being turned off