Use destination world when preloading spawn chunk (#7441)

Author: PureGero

patches/server/0363-Fix-items-vanishing-through-end-portal.patch

@@ -13,16 +13,16 @@ 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 62f19eafbb650dfbfac31c320e4883149d327e43..a9705e54b88339e2746348aee9ab1acdae5182b2 100644
+index 62f19eafbb650dfbfac31c320e4883149d327e43..ae0ae298ff7ae129959ff6e4024eb7060c0786e4 100644
 --- a/src/main/java/net/minecraft/world/entity/Entity.java
 +++ b/src/main/java/net/minecraft/world/entity/Entity.java
-@@ -3026,6 +3026,9 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
-             BlockPos blockposition1;
- 
+@@ -3028,6 +3028,9 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
              if (flag1) {
-+                // Paper start - Ensure spawn chunk is always loaded before calculating Y coordinate
-+                this.level.getChunkAt(((ServerLevel) this.level).getSharedSpawnPos());
-+                // Paper end
                  blockposition1 = ServerLevel.END_SPAWN_POINT;
              } else {
++                // Paper start - Ensure spawn chunk is always loaded before calculating Y coordinate
++                destination.getChunkAt(destination.getSharedSpawnPos());
++                // Paper end
                  blockposition1 = destination.getHeightmapPos(Heightmap.Types.MOTION_BLOCKING_NO_LEAVES, destination.getSharedSpawnPos());
+             }
+             // CraftBukkit start