Hi there.
I'm very sorry your issue has sat here for so long without a response.

Us volunteers are a little on the burnt-out side right now! That's not an excuse, though, but let's see if we can make some progress, if you're still around after all this time...
I've opened a ticket for this case, TT # 3834, thanks for the excellent documentation of the problem.
I do know that GUBA has pitcher endurance set to Very Low. I wonder if that could have any impact?
At any rate, I will try to get Markus to take a look at this one. Thanks very much, and apologies again for the delay.
Steve