Dealing damage to the Dragon while it is perching {DragonPhase:3}, will suspend the Dragon in a constant state of attempting to reach the highest point at (0,0) (which is usually the exit portal.) From my testing, this seems to work indefinitely.
MC-224316
Dealing Damage to Perching Dragon {DragonPhase:3} Suspends Dragon
Resolved
Awaiting Response
1
This report is invalid as your game was modified when experiencing this issue.