This is not a bug. Haven't tried it myself, but am told if you spawn a T-34 and start turning the turret soon as you spawn, the turret will be pointing backwards before your tank becomes visible to the other player. The T-34 turret is a fast turner compared to the other tanks in the game. Because of the time difference due to frame rates or slight lag inherent in the game, by the time another player sees the T-34, its turret is already pointing at the camping tank. That's why the T-34 is a good and effective camp breaker, provided no one else spawns at the same time and blocks the T-34's view.
Les