Actually try scanning the burn marks -> they will NOT be HIGHLIGHTED 😉
If you still have radiation lvl 3 at the 4th marker you either did not cleared the radiation, (cleared the Eos vault.) or you did not waited long enough for the radiation to clear. (get on with the main story away from Eos.)
I've done it several times with the radiation lvl at 3
Level 3 is killing you pretty quick, so I assume that the 4 marker is set on purpose in this area and the Devs wanted that you only are able to do it after the radiation is cleared.
It's not that it kills you quick as it just won't let you finish a scan. It kicks you out. I start another character just for testing and got them there. No problem. Like I said, it's a bug and it affects you once in a while. I've had other character not have any problem either and a few who had the bug. Just irritating is all.
