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Describe the bug
When the dragon aggros endermen they attack it, if it's landed on the exit portal they can teleport him elsewhere which causes the dragon to get stuck, repeating the landed attack cycle.
To Reproduce
Steps to reproduce the behavior:

• Fight End Dragon
• Wait for an enderman to teleport it while landed

Expected behavior
Dragon will be teleport a number of blocks away and repeat the "landed" attack cycle for far longer than it should. Eventually it might resume flight.

Screenshots
Landed dragon teleported

Info (please complete the following information):

• Modpack Version: 2.76.2
• Server or Singleplayer: Server
• Version the world was created on: 2.76.2

Additional context
None at the time

Well, this was fixed in dev.

So, this is an issue @SandwichHorror and I have been trying to fix. I believe it used to work, but I'm not sure what happened. Either way, we'll be doing what we can to fix this in 2.78.

Not really possible to do anything about it until Rough Mobs Revamped fixes the entity targeting blacklist.

Has an issue been opened for this?

yeah mentioned it to Rough Mobs Revamped dev a while back, they haven't really updated the mod since then so I assume they're busy 😢

Did you open a GH issue for it? (so I can link it)

not explicitly the same bug, but this bug being fixed ought to address it, I mentioned it in the comments at any rate
p1ut0nium-git/Rough-Mobs-Revamped#17