The server loads a map, before any client logged in, and starts spitting these messages for a scene and a camera component of an un-possessed pawn, placed on the level:
Warning: Attempted to access TRASH_SceneComponent_5 via property ProductRoot, but TRASH_SceneComponent_5 is pending kill
For the first connected client the pawn looks and works as expected. For the second client the pawn exists (according to GetAllActorsOfClass) but it’s nowhere to be found.