Rotation tag not working with WitherSkulls
WitherSkulls instantly revert back to a Rotation of 90, -90 after having their Rotation altered.
Steps to reproduce:
/summon WitherSkull ~ ~ ~
{direction:[],CustomName:"Test1",CustomNameDisplay:1}/entitydata @e[name=Test1]
{Rotation:[0f,0f]}#Says that Rotation was set to 0, 0
/entitydata @e[name=Test1]
{CustomNameVisible:1}#Says that Rotation is still 90, -90
Created Issue:
Rotation tag not working with WitherSkulls
WitherSkulls instantly revert back to a Rotation of 90, -90 after having their Rotation altered.
Steps to reproduce:
/summon WitherSkull ~ ~ ~
{direction:[],CustomName:"Test1",CustomNameDisplay:1}/entitydata @e[name=Test1]
{Rotation:[0f,0f]}#Says that Rotation was set to 0, 0
/entitydata @e[name=Test1]
{CustomNameVisible:1}#Says that Rotation is still 90, -90
Added Assignee:
[Mojang] Searge (Michael Stoyke)
Won't Fix
see Searge's comment in MC-67918
(@StevenNL2000: That is a Jira bug, if you copy it, it doesn't copy the space properly if there is a line break)

Using wither skulls directly is not supported and modifying internal data via NBT during the lifetime of an entity can result in unexpected behavior.