Firstly load them by holding LMB in “World Partitioning” and select all cells, then right click and choose Load Selected Cells, see this post: World Partition Cells not unloading properly - #5 by L.F.A
Firstly load them by holding LMB in “World Partitioning” and select all cells, then right click and choose Load Selected Cells, see this post: World Partition Cells not unloading properly - #5 by L.F.A