Just reproduced in a clean install in a VM to rule out configuration cruft on my laptop. With plasma-workspace 5.18.5 it doesn't appear, on 5.18.8 it does, as shown in the attached video.
** Attachment added: "kubuntu-screen-locking-after-upgrade.webm" https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1961447/+attachment/5562100/+files/kubuntu-screen-locking-after-upgrade.webm -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to plasma-workspace in Ubuntu. https://bugs.launchpad.net/bugs/1961447 Title: Cannot unlock screen without mouse click To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/plasma-workspace/+bug/1961447/+subscriptions -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs