Sometimes I bring over levels from Unreal assets, but they had navigation baked in. But I can’t see any way to clear that navigation (Even in Unreal I don’t see the NavMesh), yet I get these errors. Any quick way to fix this problem from a migrated level?
Found disallowed object /Script/Engine.NavigationSystemConfig
Found disallowed object /Script/NavigationSystem.NavigationSystemV1
If you copy paste the actors in the level to notepad, copying it again within Notepad, and then back to the editor that might sometimes strip out some of the data that is not longer present in that build of the engine.
Alternatively look for the nav mesh info within the text in Notepad and manually remove it there before pasting it back.