Multiple "RecastNavMesh-Default" objects appeared in my level, can't delete?

I’ve been adjusting some navmesh settings (mostly from following this video fwiw), which I have done for this map several times in the past without this happening, but this time something has caused the appearance of multiple “RecastNavMesh-Default” objects in my outliner…

As you can see, most are also “Unloaded” by default, but I don’t know why they are just now getting created in the first place, and it won’t let me delete them. Does anyone know what setting change generates these, and can I delete them? (should I delete them? They don’t seem to be in use, but if that’s the case, I don’t know why the engine keeps them around?)

RecastNavmeshes always get set up for me when I have a navmesh. I don’t think there is anything wrong with them. If you want to delete them, they would need to be loaded in World Partition. I think they would get recreated though.