Yes, you are the first one to respond. Yes, the unexpected behavior is still present in version 1.26.5.0 of MSFS 2020. (NVIDIA driver 516.59, Windows 11 build 22000.778)
Simulating an emergency is probably the best way to describe how I discovered the issue. However, certainly more casual than a professional 737 simulator and probably not even close to how serious some people do emergency scenarios in MSFS 2020.
I want to clarify that I have not tested this scenario on a 737. I tried to do it on the B747 and B787 but neither are suitable for the maneuvers I described when completely turned off. The B787 is fly-by-wire therefore you are not more than a passenger without electronics. The auto throttle of the B747 just stopped responding even before I powered the plane down mid-flight.
In any modern airliner, including the 737, you won’t land or glide any longer distance without hydraulics. Without it good luck at moving the controls if they are even physically connected. And everything I know of that powers hydraulics will generate electricity.
I would assume that you could glide and land the relatively small Cessna Longitude without electronics. But the number of power sources makes it ridiculously unlikely to ever be necessary. It is effective at reducing the volume tough.