I don’t know if 343 already knows about this, but people have found another way to get out of the BTB map Scavenger again and it needs to be patched in the November update. I won’t describe how to get out of the map, but I’ll post a screenshot of where the barrier needs to be located.
In the screenshot below, it’s at blue spawn and my AR reticule is placed where the barrier needs to be put in place. If you can’t tell where that is from the screenshot, stand where the suppressor spawns and look towards the map boundary rock wall that has the back half of the huge spaceship in the background. There is a giant rock formation that’s lighted by the sun and connected to it on the right is a darker rock wall that’s much higher in height. Where those two rock walls connect is where the barrier needs to be.