Missing icons on non-plasma Linux

This issue sonds similar to one I had with neochat: network/neochat#177 (closed) (more recently, network/neochat#402 (closed))

I use sway, and occasionally KDE plasma on the same computer. Installed from Arch package repositories.

Launched normally	Launched with QT_QUICK_CONTROLS_STYLE=org.kde.desktop itinerary