if you give a shulker the invisibility potion effect it will still dispaly its head
steps for recreating:
1. /summon Shulker
2./effect @e[type=Shulker,r=2] minecraft:invisibility 200 1
3. look at the still visible shulker head
MC-84452
Shulkers heads dont disappear when invisible
Resolved
Duplicate
0
Adam Eason
(Unassigned)
Unconfirmed
Minecraft 15w31c
Retrieved
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-82855. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.