SUMMARY
I am using plasma with Wayland and I found out that custom hotkeys for keyboard input cause a minor crash and do not work. 

STEPS TO REPRODUCE
1.  Go to “Custom shortcuts” in system settings
2.  Right Click (on folder or specified place on the left) → New → Global Shortcut → Send Keyboard Input
3.  Set your trigger hotkey
4. Set your action (what you want it to write). I wanted it to write grave accent character (ASCII=96).
5. Press your hotkey combination and wait for the notification and observe the system tray.

OBSERVED RESULT
Doesn't write word/character, 3rd party apps in system tray disappear and reappear, and sometimes you get a crash report dialog.

Operating System: Arch Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.17.5-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-8700 CPU @ 3.20GHz
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon RX 480 Graphics