Use destination world when preloading spawn chunk (#7441)

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

@@ -17,12 +17,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/net/minecraft/world/entity/Entity.java
 +++ b/src/main/java/net/minecraft/world/entity/Entity.java
 @@ -0,0 +0,0 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i
-             BlockPos blockposition1;
- 
              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