Thanks for playing.Thats not a bug, those people appear in the bathroom during the scare and disappear you just got crowded by them and they have collision. Some scares are indirect or subtle hence why you may not seen it, furthermore the game uses a randomized audio pooling system all the time so what you heard may not actually be a jumpscare. Glad you enjoyed the demo and see the games potential!
You can wish-list the full game here, it greatly helps me. Thanks