Electrical system issue
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I’ve just purchased the Professional Cargo/Floatplane variant from the XBox 2020 Marketplace. There is a global issue with the electrical functionality.
When the plane loads, either on the ramp or the runway, the EFB shows all circuit breakers except for the flap motor and standby flap motor as pulled, but they don’t appear that way on the physical panel and only the flap motor circuit breakers are functional.
Consequently, nothing electrical works except for GTN, GNS, transponder, and radar avionics and related avionics switches, and lights. No other avionics (KX 155B, AP), engine-related switches and gauges, annunciator panel, etc. work. No failures are shown in the EFB. I have reset all potential failures.
The plane will load on the runway with the engine running and flies beautifully but no engine-related gauges work. On the ramp, no engine-related switches work for a cold and dark start.
I have reinstalled the file several times, reset the XBox console, and finally reinstalled the sim itself and all add-on files. The presence or absence of add-ons has no effect.
I have had zero issues with previous BS releases, including the recent Baron/Bonanza Professional bundle, which I just used for a circumnavigation of the continental US.
Not sure what I am missing at this point. Any suggestions are welcome. Thank you!

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I’ll add a couple of more clues: the numbers on the LCD thermometer are garbled; the EFB can’t be moved (it can be placed in the VR static position though); and the instrument/cabin lights don’t work, when you spawn cold and dark, but they do work if you spawn with the engine running.

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It's actually extremely rare that I use the words "corrupt installation", but I think that's the only explanation here. The real giveaways are the immovable tablet, and the engine instruments being stuck at their zero animation position, rather than their programmed zero position. This means that the model behavior file is literally not being loaded or interpreted by the simulator.
Since we can see the altimeter working, which is one of the only Asobo default templates left that I use in any of my aircraft, I would guess the problem is that my "templates" file is not being loaded. In this case,
CaravanProfessional_Templates.xml.Do you have access to developer mode on XBOX, do you know? @ploodovic, are you also on XBOX? I would really like to know if
CaravanProfessional_Templates.xmlexists in the virtual file system, and where.Am I correct that this is affecting only the Cargomaster in MSFS 2020 for both of you? I hope so, because at least that would give me something to go on.
I would also like to take a moment to acknowledge how helpful screenshots are. It's understandable why you might have guessed this was an electrical problem, but it actually has nothing to do with electricity at all, and it was the screenshots that made that so clear.
EDIT: I had a vague memory of encountering this problem in MSFS 2024, and I found a comment in a file for myself about MSFS 2024 requiring a redundant reference to that template file that MSFS 2020 did not need. I suppose it's possible that XBOX somehow also needs this redundant reference, but I find it unlikely that this wouldn't have presented itself with my other aircraft that are structured similarly.