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Paper/Spigot-Server-Patches/0105-Fix-Double-World-Add-issues.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
Date: Tue, 21 Jun 2016 22:54:34 -0400
Subject: [PATCH] Fix Double World Add issues
Vanilla will double add Spider Jockeys to the world, so ignore already added.
Also add debug if something else tries to, and abort before world gets bad state
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index a4d666480f0211d39e62b82e43100e3d436f4d90..b27ebc0726ecd13062f5cbf49edca2e5cfa4a4c3 100644
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--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -927,6 +927,7 @@ public class WorldServer extends World implements GeneratorAccessSeed {
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// CraftBukkit start
private boolean addEntity0(Entity entity, CreatureSpawnEvent.SpawnReason spawnReason) {
org.spigotmc.AsyncCatcher.catchOp("entity add"); // Spigot
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+ if (entity.valid) { MinecraftServer.LOGGER.error("Attempted Double World add on " + entity, new Throwable()); return true; } // Paper
if (entity.dead) {
// WorldServer.LOGGER.warn("Tried to add entity {} but it was marked as removed already", EntityTypes.getName(entity.getEntityType())); // CraftBukkit
return false;