I was looking for a reason why I can’t save and then load actors that are on an unloaded chunk in the world partition. I kept having an engine crash with a similar error to yours. I was already very broken because I couldn’t find a solution anywhere, I was lost because I thought it was the fault of the save system that does not work with unloaded World Partition chunks. Luckily I found your post. You are a hero!
Anyone who tried to combine world partition with Easy Multi Save - It works, I had to check the player start checkbox “Is Spatially Loaded” to true as my friend wrote in the post above. Thanks again! 
1 Like