[Crash] Browsing through the comboxes in Qt widgets application causes the linux to crash (gnome-shell crashed with SIGSEGV)

Steps to reproduce:

1. Launch any Qt Widget Application with combo boxes (I created a simple example to reproduce it - attached).
2. Click through the combo boxes selecting different values.

Expected: Values are selected - app is still working.

Actual: It causes the Linux to crash - I need to log in again and reopen all my apps again. See attached video.

Reproducibility:  100%

Notes: The issue is not reproducible when built with Qt 5.15.12