[qubes-users] Minimize to tray not possible (KeepassXC) - for security reasons?

Today I noticed that KeepasXC cannot minimize to Tray in Qubes. Is this
for security reasons (so windows/applications cannot hide from the user)
or is this a bug? And if so, it is about Qubes, Fedora, XFCE or
KeepassXC? (Maybe someone has a non-Qubes fedora to quickly test that out)