I refuse to up Tiger II's. Every time I've upped one, I've been one shotted in the frontal armor by an M4 at 2000+ yards, ridiculous. Tiger I's and Panthers work best for me, they actually deflect some rounds.
As for the argument that it's a ricochet, I'd like to point out that I'm well aware and can tell the difference... Once you see the shell bounce off at a different angle. The bug that is being discussed is when you hit a tanks square, get no hit sprite, no ricochet, and the round simply passes right through it. For me, I can see the puff of dirt coming up behind my target in these instances that lets me know exactly where the round hit... and I'll normally review it from multiple angles in video when I get really urked about it.
Poster earlier hit the nail on the head in referencing the fact that there are two separate objects for the turret and superstructure of the tank. You can see this in how they cast shadows. It seems to me that there's an area where the overlap isn't correct on the objects and it allows rounds to pass harmlessly through air, where there should be tank.