shulker heads are following you if you are in gm3 (spectator)
i was seeing this when i did a kind off shulker vs shuler teamdeathmatch and i think its a glitch/bug
i made 2 screenshots
also if you put invisibility potions on them this happens (the time doesnt matter)(splash potions)
Environment
WIN8.1
Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.