I put the airplane at 14200 rpm and into a climb that never ends. This plane exhibits the same behaviour at FL180 as it does at FL290. I think it should at least stall a bit..?

 

 

 

Edited March 22Mar 22 by wf971
added video thumbnail

I noticed this too, the plane should start to roll on stall as per the attached accident report. there should also be a stick shaker noise and/or animation.

OTHERPROPS_F27-Loss_of_Aircraft_Control_on_Approach.pdf

Starting from 10.000 ft, diving to achieve 200 kt ias, and pulling up to try to stall the plane, there's evidently no stall possible in this aircraft. It just goes for a loop (if you let it), otherwise holding straight ahead, it'll lose speed until 20-40 kt ias and begin to drop straight down.