Affected Service: Hide and Seek
Explanation of the bug: Hiders and seekers can force themselves into walls if there’s a trapdoor on the top half of the wall block. You somehow get forced directly into the block that the trapdoor is on if you open and move into it. It’s pretty easy to do, I stumbled on it by accident. It’s pretty busted since you can’t be hit while stuck in a block. It can also be done on several maps, but the video only includes Hospital and Talavera. I can include more examples if needed.
Videos: Trapdoor glitch - YouTube