Re-entering a world resets Ender Dragon's health bar which is game breaking since items dropped upon death in the end dimension might turn invisible and the only way to make them visible again is to re-enter a world...
See the problem here?
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[Mod] Neko
isnt this because leaving and rejoining the game despawns the enderdragon and then respawns it?
violine1101
Duplicate of MC-105080
Cannot reproduce. Is the dragon's health bar resetting while it's alive or in its dying phase? Also, are there still end crystals around?