QtC: Freeze changeing the properties configuration

I was editing the properties here and the tool froze:

I reproduced, it freezes at the exact moment I get to the "Function" scope and want to change it:

Yep, just Backspace on the text

Upate:

If I edit the attributes in the xml file manually, it also causes issues in the DV editor - making it very slow/ unresponsive

And even though the field appears it is not possible to edit it

By slow/unresponsive this is what i mean: