[{quoted}](name=Ariel the Cruel,realm=NA,application-id=LqLKtMpN,discussion-id=3ZqQgIq2,comment-id=0000,timestamp=2020-02-12T03:24:12.305+0000)
Not a bug, actually. At least, probably not. Just really really hard to do (Especially with Pillar). Hard enough that I don't know if you could actually do it intentionally in a live match.
The game already pushes characters out of the way when stuck on terrain. So what likely happened was there was enough room to hold your collision box, but not enough in either side of you to fit. This is most likely to occur next to not-perfectly straight walls. This can also be accomplished by any type of player made terrain.