just had the same incident, I went on like a 5 game losing streak at around 2am pretty sure I was still asc 6, lost 1 today dropped to asc 3, won 1 right after and dropped to phantom 3
Honestly, I think they went a bit too far not being able to put a door anywhere in spawn, the only issue I saw was placing it past the invisible barrier.
finally it was fixed, it was just a dumb situation to be stuck in, people will always want cheese (me included because it's fun, but we have to realize when something is busted or just plain unfair.