The icon doesn't show on KDE Wayland.
arch-audit-gtk 0.3.1-1
Operating System: Arch Linux
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.1-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Graphics Processor: Mesa Intel® UHD Graphics 620