SUMMARY

After upgrading to 6.3 every login will cause kwin to crash. The crash will cause the panel to break, wallpaper to not render and applications life firefox to also not render a window.

Using a new user will not crash on first login, but after changing display settings (setting scale to 200%, disabling 3/4 screens) it will also crash. Enabling the screens and reseating scale doesn't seem to fix it..

STEPS TO REPRODUCE
1. Login to kde plasma 6.3 x11 session

OBSERVED RESULT

kwin will crash breaking panel and firefox

EXPECTED RESULT

kwin not to crash

SOFTWARE/OS VERSIONS

Note this is pre upgrade as I had to rollback to get a usable desktop.

Operating System: Arch Linux 
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 62.7 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: X570 AORUS ELITE
System Version: -CF

ADDITIONAL INFORMATION

I've  submitted the crash dump throught the reporter.