I placed a Nav Mesh Volume and used Move to Actor to implement an AI that moves to the player.
However, if you save with the Nav Mesh Volume placed or build the navigation path, the AI will not work.
If it is not saved or the navigation path is not built, AI will work normally.
It was normal for Maps that do not use World Partition.
I am using 5.0.0-16682836 +++ UE5 + Release-5.0-EarlyAccess.