I did not pick a gamemode, for it affects both. The problem as you will/can see in the pictures I show here is the 1st person arm bug where your hand turns inwards isn't just with vehicles. It happens randomly, but if I turn around, it's normal again. There is no way to fix this until it just goes away by itself, or you restart the game and hope to God it goes away. it's actually been happening since around 1.5.2 .
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kumasasa
Why "back" ? Was it already reported ? What ticket number ?
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
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This happens when a player or mob is in any vehicle and in view. When you turn around and the player/mob is not in view, hand is normal, turn back and hand imitates mob/player.