strange Adwaita tray icon difficulties

Dear all, I am experiencing some strangeness with the Adwaita tray icons of VLC and volumeicon. They disappeared from the tray around this summer (unfortunately no precise data here) and I needed to revert to the latest working package adwaita-icon-theme-41.0-1-any.pkg.tar.zst for those icons to work again. My environment is using stalonetray and a very simple window manager (no Gnome, no KDE whatsoever). Are others impacted as well ? Any clue how to get back on track ? Interestingly last week some apps suddenly showed completely black windows: simple-scan and pavucontrol, and i had to revert to older packages to make them work again. Are those phenomena related? Thanks for any help. Daniel