bug#52686: menus in qt programs not visible or appearing far away on wayland

[bdju]

guix system
guix (GNU Guix) b3a0db7a0e5fa7186c090647cfd5666e2b9287ff
sway

In keepassxc the menus don't show anything when clicked.
(actually, I restarted it and now they work, but leaving that in to show
it was multiple programs)
In pcmanfm-qt the menus at the top as well as the right click menu don't
show anything.
In nheko the right click menu appears very far from the cursor, the same
spot regardless of where in the window I've clicked.