I don’t know what it would do. I’ve not experienced it doing anything other than what was programmed. While anything is possible, its possible that the few that have said it did did not have something set properly. My guess is the most likely possibility is it crashing from hitting something or from having a propeller come off. If you check your props and don’t count on the collision sensors, you should be ok. The obstacle avoidance is great, but if you are flying blindly counting on the obstacle avoidance, you’ll be disappointed.
Also, be aware of your surroundings, so if something does go wrong, you have a good possibility of finding it. Try avoiding places you don’t have access to. Use find my drone on the app