It’s not a bug. It is their spawn. It prevents you from spawncamping them like you are doing in that screenshot.
Maybe, if you move away from their spawn, they won’t be invicible?
No, it’s a lot different than that. It’s a spot inaccessible normally, at the back of ‘XXXXX Refuge’ (Southwest supply camp) It’s not their spawn. In my server (SoS) particularly, JQ were using it to camp the area, flipping it almost as soon as we took it (mind you, this is even after a COMPLETE sweep of the area, they seem to suddenly appear from the ground, we all know what this is)
To be honest, it sucks that even in T1 there’s this sort of exploitation going on from all sides.