I was recently forging on Ghost Town, spawned a box, then flipped it over, and it merged with the floor like butter, then just to check, I tried it on Blackout, same thing happened!!! What's up with that?
Isn't that just your Xbox's ineptness? The new DLC is fine for me, and I suspect that it is working fine for everyone else.
It's basically an odd glitch with forging on some maps. It's happened to me on Foundry, it's like an over exaggerated geomerge. I don't think it has anything to do with the new maps, and it only seems to happen with unmovable scenery.