So callled "Invincible End Crystals"(They are the end crystals that get spawned in the "animation" when respawning the Ender Dragon) have issues with their hitboxes and teleporting. Everything from creation to the bug is shown in this video: https://youtu.be/WcnbBK3mASA .
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We're tracking this issue in MC-44654, so this ticket is being resolved and linked as a duplicate.
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