Spectator Gamemode

So i have recently noticed a lot of bugs in the spectating gamemode

So first is that when i got to a mob's vision, the mob doesn't move his head anywhere, if i press F5 / change person, i can see that the mob is clearly turning his head everywhere, but in spectator gamemode, it doesn't work.

Then i have noticed a sound bug when i go to player / mob vision, when it leaves the area, where i go to the vision, the sounds disappear because i don't have any interaction to the world, the game haven't updated my location to play sounds.

3rd bug is that almost same as the 2nd one but when the player / mob moves, the particles don't face at me and all particles gets messed up and it doesn't look really nice.

Steps to Reproduce:
1. Go to any mob's vision and watch the frozen screen for 3 minutes, then change your person with F5.
2. have 1 friend with you, and go to his vision on the spectating gamemode. tell him to move around and notice all the bugs!

(BTW. when me and my friend downloaded 1.8.1-pre 5 and we joined the realm server, it was super laggy)