I have a Samsung Flip 4 on Android 13 and so far the app is working normally - I've just checked in for a flight tomorrow and was able to download by boarding pass (also emailed it to myself from the app as I always do). I'm also able to see my upcoming flights. I'm not going to chance logging off and back on until I've landed in London tomorrow evening, but I will try once I'm home.
The widget however has not worked properly for some time and no longer shows my next flight

The only thing I can suggest not only clearing the cache but also data, and then uninstall app/reboot phone/ reinstall app