Errors i can't understand. SetSystemInterested

I get these errors in Unity 2018.2.5.1f.
They just suddenly appeared and they don’t say anything else then what’s shown in the picture.
Anybody knows what’s causes this?

On a play in the editor I two of each.

“System is not interested in this transform, SetSystemInterested may only be called on transforms that are set interested.”
“System is already interested in this transform, SetSystemInterested may only be called once.”

Haven’t found anyone else with this problem.

Found the culprit by enabling on and off each and every item in my hierarchy one by one (over 7000 objects)

But for me, it was one object that had 2 Nav Mesh Obstacle components on it.

It would be nice if these errors could have mentioned that in any way…

This happened to me with 2 MeshRenderer in one object ,