@BrUnO_XaVIeR Do you know about any problems with 5.4.1 and World Partition? Actors placed on the map doesn’t seem to be saved. Actors spawned at runtime are working correctly. If you place an actor in the world, save it, then move a little bit around and start PIE without saving the modified actor it is working as well.
Check out this small example project https://drive.google.com/file/d/12Go-EbjDQFT7hHZbaaGi06EBsDd6aY4f/view?usp=drive_link. Save/load with “6” and “8”.