Using vault in or around buildings can get you stuck into walls. After about 10-20 seconds of being stuck, the game will instantly kill you. I have died numerous times to this, so reproducing it shouldn't be a problem.
- Legacy ID
- Game Physics
Vault around steps, building corners, and vaulting on top of objects, this will cause you to get stuck and killed.
Non-modded gameplay will help the devs determine whether it's a mod-issue or engine-issue.
If mod, then there's nothing they can or will do, up to the mod author to fix it.
If engine, then they have to do something about it.