Lock screen broken after 2022-05-23 update

[ddddjent]

Kscreenlocker error. Cannot mix cannot mix incompatible qt library (5.15.2) with this library (5.15.3)

Then try this

I had the same issue like that. I checked the KSystemLog and it said that I had used incompatible Qt library. It’s because qt5-virtualkeyboard-bigscreen in my pc was outdated. I just replaced it with a newer qt5-virtualkeyboard and it works.