Looking around I can see that this error is quite common and seems to be a problem with WorldPartition level streaming, however I haven’t seen a solution to this error. Why might this be happening? How are levels typically loaded to avoid this?
It occurs when loading this level from another level. For now, I’ve just made a new level without world partition and that loads fine. I’m not going to mark this as resolved though because it isn’t resolved and a lot of other people seem to be having this problem as well.