Monsters stuck in doortracks, walls or hanging off lifts

If a monster is pushed onto a ledge by being attacked, or is standing on the threshold of a lift which begins to ascend, it may become trapped on the edge of the raised sector. The monster cannot normally turn, fire a weapon, or use projectile attacks in this situation (scratching/biting attacks, if any, are sometimes available). Lowering the lift a second time, or attacking the monster again so that it falls off the ledge entirely, releases it from its confined state.

Boom and its close derivatives include fixes for this bug.

Demo

 * [[Media:Map01 stuck.lmp|A trooper stuck on a lift]] ([[Image:Map01 stuck.lmp|file info]]) in MAP01: Entryway.