[DRG]

I had a look and that one is so strange it might very well be intentional. There is no other way to get that to happen except deliberately as the hex height is -2 and the hex height N - S of that position is 11 as are the hexes E-W of it..... though WHY that might have been done will remain a mystery as the scenario is 2 decades old but there is a very deliberate hole put there then bridged over tells me this was intentional for some reason.

Perhaps to simulate an underground sewer that collapsed from arty?? ....IDK But yes, it is kinda weird but it does not look like something that was the result of game code changes. What it looks like is a deliberate "game changer". There are only three German Stugs and that one IS-1 on the Soviet side. If that hex is hit with arty the game will, I suspect, play out differently than if it's not.