BUG: Shift-Ctrl-E to export audio does not work anymore

I have been using Audacity for music recording for many years now. It is a great tool and I appreciate your work on it.
However, there is a new and nasty bug for few months:

The keyboard shortcut Shift-Ctrl-E does not work anymore.

The UI gets in a very strange state in which it cannot be operated properly anymore.

After pressing Shift-Ctrl-E again the UI becomes operational again.

Expected behaviour: Pressing Shift-Ctrl-E opens the file dialogue to export the tracks, e.g. as MP3 file.

This seems to be a pure UI issue.

My Operating system is SuSE openLEAP 15.2. My desktop is KDE plasma5.

Try resetting the keyboard setting to defaults (https://manual.audacityteam.org/man/keyboard_preferences.html)