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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 1 Jun 2016 23:29:17 -0400
Subject: [PATCH] Reset Ender Crystals on Dragon Spawn

Crystals can end up in a bad state in certain conditions which causes
an exception on the expected number of crystals going negative.

This ensures the crystals/pillars are in expected state when the dragon spawns.

See #3522

diff --git a/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java b/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
index f713a1fefb0d8505672d653cf67ead13e321144f..b1a0654ba01c265385db877d528c1aa2103b2eb0 100644
--- a/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
+++ b/src/main/java/net/minecraft/world/level/dimension/end/EndDragonFight.java
@@ -408,6 +408,7 @@ public class EndDragonFight {
         enderDragon.moveTo(0.0D, 128.0D, 0.0D, this.level.random.nextFloat() * 360.0F, 0.0F);
         this.level.addFreshEntity(enderDragon);
         this.dragonUUID = enderDragon.getUUID();
+        this.resetSpikeCrystals(); // Paper
         return enderDragon;
     }