I’m using Full Wayland KDE and when I lock the screen, the screenlocker/saver dies immediately when I shut off my TV with an error that says to use loginctl unlock-sessions to unlock the broken screenlocker/saver BUT IT DOESN"T WORK. The only thing that works is a reboot. I opened a KDE Bug and about 7 others so far said they have the same problem and one of them noticed that we all use AMD Radeon GPUs. The Bug number is 439096
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I think this information will benefit lots of KDE users. Thank you for being so kind to share it. 
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The bug has been fixed. Needs to be verified. Expected to be in the 5.23 version of KDE Plasma.
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