I've only tried the jagpanzer but what I noticed was once I would set the range on my turret scope it would change back to zero if I jump out of my turret and then back in.
That has been noted already.
What we don't know is if HTC intended for that to happen, no comment has been made. We do know that HTC did intend for there to be no tank commander HUD showing the gun FoV, the ammo count, speed, direction, and engine gear. Not only do many of us hope that HTC corrects the tank sight from defaulting to 0 every time a player switches between positions in the Hetzer, Jagdpanser IV 70, and Jagdpanther, but we also hope to see the HUD be introduced somehow since we no longer have a source for that information.
Also, though I have not tested it yet evidently there is an issue with the gun sights on the new Jagd tanks as well. I didn't notice if the Hetzer has a 5X (correct) or the 2.5X (incorrect), but I do believe I remember the Jagdpanzer IV having the 5X (correct). I didn't take notice of the Jagdpanther's zoom power either, it is supposed to be 10X.
