Paper/patches/server/0371-Fix-items-vanishing-through-end-portal.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: AJMFactsheets <AJMFactsheets@gmail.com>
Date: Wed, 22 Jan 2020 19:52:28 -0600
Subject: [PATCH] Fix items vanishing through end portal
If the Paper configuration option "keep-spawn-loaded" is set to false,
items entering the overworld from the end will spawn at Y = 0.
This is due to logic in the getHighestBlockYAt method in World.java
only searching the heightmap if the chunk is loaded.
Quickly loading the exact world spawn chunk before searching the
heightmap resolves the issue without having to load all spawn chunks.
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index b108ba1c99423011f75881bf3d7440c501084c28..5d0118a753b044b1cd83298964be16a1ee87729f 100644
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--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -3007,6 +3007,9 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
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BlockPos blockposition1;
if (flag1) {
+ // Paper start - Ensure spawn chunk is always loaded before calculating Y coordinate
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+ this.level.getChunkAt(this.level.getSharedSpawnPos());
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+ // Paper end
blockposition1 = ServerLevel.END_SPAWN_POINT;
} else {
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blockposition1 = destination.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING_NO_LEAVES, destination.getSharedSpawnPos());