On the Super Retro Map for chaos mode Bedwars, there is a way to get soft-locked in a gap with no way out. This can be abused as players may intentionally trap themselves as it makes them hard to hit.
Basically, at the end of each team base, there is a glass pane. There is one block of airspace behind that glass pane. If you line it up correctly, you can use an ender pearl to teleport in by throwing it at the gap under the opening and jumping. I've attached a drawing, sorry I'm not a good artist, but it should make this bug easy to reproduce.
Steps to reproduce:
1. Join Bedwars Chaos Mode.
2. If the Super Retro Map is not chosen, quit and repeat step 1.
3. Obtain 4 gold and buy an ender pearl.
4. Ender pearl into the tiny gap under the airspace.
5. Jump.
6. Notice how you are stuck in the gap with no escape.