I've loaded up your first save, Arkadiy, in the dev version and looked at it. In the dev version I can see all units. The message indicates the destroyed truck was returning to CCB 4 Armoured Div Base from a supply run, and if you click on the supply line option you'll see where that base was trying to supply to. I see 4 units it was trying to supply where the supply line could possibly run through enemy control on the control map. In particular the red line from CCB 4A base to D Co 8 Tank Bn indicates that its supply is blocked and there are indeed enemy units between this unit (and others) and the base in question. I don't know whether you can see these units just by surrendering, but 9 Pion Co, of 9 SS Panz Reg is, I imagine, the unit that shot up your truck whilst it was trying to cross snowy hillsides in the pitch black. The SS Company is in column formation, more or less along the dirt track across the hillback there, and - if we want to imagine what happened (though the supply mechanic is actually a bit more abstract) - we could imagine that the lone supply truck tried to take that track to get to D Co 8 Tank and ran into the scouts for the German column, turned round, abandoning its run, and was then spotted and shot up. You'll note that D Co 8 Tank has a supply aborted message in its log, as a consequence. If the supply truck had only continued along the larger road another couple of kilometres towards the positions of 53rd Armoured, then turned off, then it might have been ok - but these things happen if you're trying to move around unsupported in -4degrees, heavy snow, zero visibility in a war zone. It was certainly a courageous effort at resupply. That's how I would think of it, anyway.
Certainly - with the exception of being able to see the enemy units - all of this can be seen without the dev version, providing you trust what the control map and the supply line graphics are telling you.
I attach a picture - don't look at it if you don't want spoilers, obviously, as it shows enemy dispositions.
View attachment 9257
To me this looks ok, no?
There are other things in your save - from the point of view of Axis units - that are a bit crazy, but no need to dwell on them as they don't impact your query - they're pathing issues I notice, and the patch the devs are working on now affects all that. So hopefully they will be fixed when we get the new patch.
My image shows different map graphics, by the way (if you can see them beneath the control overlay...) because I'm using the paper map mod (that's actually meant for COTA scenarios, but looks nice in the Bulge too, usually) - doesn't affect anything in your save.