Why are my actors always loaded when crossing world partition grid cell boundaries?

MostHost_LA, thank you for your response.

Can you please confirm that you mean with “old” system the Level Streaming that already existed in UE4, “new” system the world partitioning that is now available in UE5, and “tile” a world partition grid cell.

I tried as you suggested:

All without success.

Both cube static mesh actors have “Is Spatially Loaded” turned on, which according to the documentation, should be sufficient to remove it from being displayed persistently: World Partition in Unreal Engine | Unreal Engine 5.1 Documentation

However, the documentation also states in section World Partition in Unreal Engine | Unreal Engine 5.1 Documentation that “When the Level opens, the Editor will only load Actors that have their ‘Is Spatially Loaded’ setting marked as False”.
My actors get displayed after opening the level although the flag is set to true.
Does anyone have a clue why?

here in the forums people constantly complain about it being worthless…

That would be very disappointing.