Fix #5856 Entity origin (#5861)

patches/server/Prevent-Double-PlayerChunkMap-adds-crashing-server.patch

@@ -43,6 +43,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
              entity.valid = true; // CraftBukkit
 +            ServerLevel.this.getChunkSource().addEntity(entity);
-         }
- 
-         public void onTrackingEnd(Entity entity) {
+             // Paper start - Set origin location when the entity is being added to the world
+             if (entity.getOriginVector() == null) {
+                 entity.setOrigin(entity.getBukkitEntity().getLocation());