SUMMARY
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STEPS TO REPRODUCE
1.  Set up the following environment variables in a KWin startup script
export __NV_PRIME_RENDER_OFFLOAD=1
export __VK_LAYER_NV_optimus=NVIDIA_only
export __GLX_VENDOR_LIBRARY_NAME=nvidia
2.  Start plasma on wayland


What was my objective in doing this? I have an Optimus setup with NVIDIA and Intel graphics. On Wayland, I wanted to use NVIDIA as primary GPU. There was no option for doing this. Instead, the prime-run script is the only option for launching individual programs on the GPU. The script essentially sets the above variables before starting a program. So I thought I could do the same in a KWin script, so that anything spawned after that uses the NVIDIA GPU for offloading.


OBSERVED RESULT
Black screen with a mouse cursor appears. Can open applications using keyboard shortcuts (for example, Konsole using Ctrl+Alt+T), and can start other applications from Konsole. Application windows are visible, but everything else is black.

EXPECTED RESULT
A functioning desktop with all the panels, wallpapers, etc.

Operating System: Arch Linux 
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
Kernel Version: 6.4.12-arch1-1 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION