Oh, it’s that one ! It has been signaled already on this older topic.
In fact the issue is when you exit the Editor while the Definition tab is active.
The other tabs don’t do this.
Alright so it also does it in the Lower Zone but only the Info Line and Overview Line are reset, the Inspector and Definition tab stay opened.
This is the issue 11 in the issues list, I had to modify it a bit according to this new information.