Description:

Hey there,

i noticed that since recently, I am unable to start *any* QT5 based application, as it immediately segfaults on startup.
I could reproduce this with any version of qt5-wayland 5.15.2+kde+r44-1 up to and including 5.15.2+kde+r48-1.
A downgrade to package version qt5-wayland version 5.15.2+kde+r41-1 fixes the issue.

I first noticed the issue with kbibtex, but could reproduce it with okular, qutebrowser, digikam, qt5ct etc. as well.
QT6 applications don't seem to be affected (qjackctl v0.9.6-1 launches without issues).

Additional info:
I'm running a sway wayland session without a display manager like sddm and the likes.

Environment variables set on login:
export XDG_CURRENT_DESKTOP=sway
export XDG_SESSION_TYPE=wayland
export QT_QPA_PLATFORM=wayland-egl
export QT_QPA_PLATFORMTHEME=qt5ct
export QT_WAYLAND_DISABLE_WINDOWDECORATION=1

Package versions:
sway 1:1.7-2
mesa 21.3.5-1
wayland 1.20.0-1
qt5-base 5.15.2+kde+r297-1
qt5-wayland 5.15.2+kde+r48-1
qt5-declarative 5.15.2+kde+r45-1
kbibtex 1:0.9.2-6

Steps to reproduce:
Try to launch any qt5-based application.

I attached a gdb backtrace and the WAYLAND_DEBUG=1 output when trying to launch kbibtex.