Yes. If I use an axle in the back gearbox and gears in the front one, it works. If I use axles in both, then it doesn’t.
Yes, though in the images above, the torque should be the same as well. I forgot about the cables. I removed them and added separate battery boxes, but the problem persists.
I tried another scenario - I moved the gear in image one to the front of the (back) gearbox and it worked even with both axles.
I can make another video tomorrow if that would be easier.