Sneaking doesn't work in first person view if the player is in attack ready state
At a certain point we were always disabling idle animations if an actor was in "attack ready state", however, this lead to swimming idle freezing in third person view (and this issue). So the behavior was adjusted: idle animations were always reset in first person view and weren't reset in third person view if the current state was sneaking or swimming. Such difference of first and third person views was caused by an issue also present in Morrowind: if you go into attack ready state while sneaking and the player begins "weighing" the weapon, the idle doesn't get reset and the weapon flickers from the wrong position. It had been avoided such way.
Well, apparently that issue is entirely reasonable to keep: sneaking state depends on the current idle state so we shouldn't break sneaking and swimming idle animations in first person view either.
The practical effects of this issue is that you can't use Sneak skill when you are about to attack and tell if someone is aware of you because sneaking indicator is disabled. I believe having a slight animation glitch that is present in Morrowind is better than having this significant gameplay discrepancy.