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 35304d7a60348a2b4e1eec43418086086502e4ab..cae4c52e239bdbb916d69e14617814fd08279f1b 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
@@ -412,6 +412,7 @@ public class EndDragonFight {
             enderDragon.moveTo((double)this.origin.getX(), (double)(128 + this.origin.getY()), (double)this.origin.getZ(), this.level.random.nextFloat() * 360.0F, 0.0F);
             this.level.addFreshEntity(enderDragon);
             this.dragonUUID = enderDragon.getUUID();
+            this.resetSpikeCrystals(); // Paper
         }
 
         return enderDragon;