Undoing Replace Actor on Level Instances do not reload the Level Instance

Undoing Replace Actor on a Level Instance does not properly reload the previous Level Instance.

• create 2 Level Instances (external or not, shouldn't matter)
• place one of them
• use Replace Actor on it to replace it with the other Level Instance (or even with itself)
• use Undo on the Replace Actor operation
• notice that the objects inside the Level Instance do not get rendered on the scene (only the gizmo) and do not show up in the outliner either
• saving andreloading the level shows the Level Instance again properly