testserver/patches/server/0533-Fix-CME-on-adding-a-passenger-in-CreatureSpawnEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Sun, 4 Oct 2020 19:55:25 -0700
Subject: [PATCH] Fix CME on adding a passenger in CreatureSpawnEvent


diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 477b6102361f0ae03541402578e1d053572e52d3..144b5774077eb756df28c72b8cda78972ccf120e 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -3436,7 +3436,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
     }
 
     private Stream<Entity> getIndirectPassengersStream() {
-        return this.passengers.stream().flatMap(Entity::getSelfAndPassengers);
+        return ImmutableList.copyOf(this.passengers).stream().flatMap(Entity::getSelfAndPassengers); // Paper
     }
 
     @Override