To reproduce:
1) Summon an Ender Dragon.
2) Type
/entitydata @e[type=EnderDragon,c=1] {NoAI:1}
A very glitchy, rapidly vibrating Ender Dragon should result. This is likely caused by the way that the Ender Dragon turns. Relogging fixes the issue, but the Ender Dragon will be completely straight and always face North.
This does not occur with any other mob.
This seems to be closely related to my other report, MC-74114, since once this issue is fixed by relogging, the dragon no longer takes damage.
Linked issues
discovered while testing
Comments


would be 'could not be fixed' 😛

Also this was discovered while testing MC-73719 🙂.
this is fixed in 15w31b, on my side at least

Still an issue in 15w36c (sorry haven't tested it lately).

This has never been fixed. Confirmed for 15w38b

Still an issue as of 15w47c.
Reopened.
....aaaand resolved:
If changing NBT via commands does not have the expected effect, that's always considered "working as intended".
Confirmed for pre-4. Including a video demo. Seems to only affect Dragons that are not level when the command is issued.
https://www.youtube.com/watch?v=RcwsW6QDAGM