Created attachment 143394 [details]
coredump without symbols (I understand that arch does not have a debug version)

SUMMARY
Wobbly windows is a great feature that makes it so the windows wobble when being moved. I didn't upgrade my system for a few months (so I guess I had 5.22) and recently upgraded to 5.23. Unfortunately ever since then wobbly windows, alt-tab preview, clicking on grouped icons to show them all stop working. There are other annoyances such as pixels randomly turning off when they are showing a moving GUI (move my mouse over the right click menu, press enter on the shell moving the line of text up one row). However, I cannot reproduce that as easily so I guess I shouldn't open bug reports for them

STEPS TO REPRODUCE
0. Assume that you have wobbly windows selected already 
1. System Settings -> Display and Monitor -> Compositor -> Enable compositor on startup
2. Enjoy wobbly windows (and alt-tab and grouping visual stuff)
3. Press alt tab a few times (I must have a few windows opened and covering each other)
4. Crash
5. No wobbly windows (and alt-tab and grouping visual stuff)

OBSERVED RESULT
Windows move in a boring Microsoft way

EXPECTED RESULT
Cool wobbles when the windows move

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.14.16-arch1-1
KDE Plasma Version: 5.23
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This is easily reproducible. I can make a video of it or other stuff if needed.