The Ender Dragon appears to be animating at a much faster speed than normal. I've recreated this in 3 different worlds, and it only appears to be occurring with the dragons that don't have the NBT tag DragonPhase set to 10 (default when using /summon). The dragon's death animation is normal.
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Asteraoth
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Thank you for your report!
However, this issue is a Duplicate of MC-144612.
If you have additional information, please add it to that report.
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