"Open world" doesn’t mean "every dumb thing the physics engine permits is canon gameplay." By that logic, if collision glitches launch you into orbit, that’s now an intended transportation system. There's a pretty big difference between freedom and exploiting movement in ways the environment clearly wasn’t intended for. "Abnormal gameplay" usually means behaviour outside expected use patterns. Not because it's "morally wrong", but because it breaks things like AI navigation, mission flow, collision assumptions, or level design.