Client rotation is different from server

(Original http://bukkit.org/threads/bug-client-rotation-is-different-from-server.379687/ )

As I am writing GunAPI bukkit plugin, I got issues with collision check. Sometimes the shot just run thru the enemy without damaging, and sometimes normally worked. So, I created MapView + log entity yaw, and it seems like bug, that rotations on client side are different from these on server. If entity is not walking, but changing yaw / pitch only, server doesn't know about them. But when entity walks and change rotations, these changes are updated. There are few screenshots, maps are OK, as far as I logged yaw on every map redraw (100ms):

(My apologies, it's only bukkit plugin, I am not mc modder. If interested, everyone can try it by downloading GunAPI https://www.spigotmc.org/resources/gunapi.10857/ . Then get creative, OP and 33 porks, take a look at some entity and press shift - you will get similiar map)