I had a similar experience flying my Mavic 3 in the house shortly after I got it. While it was hovering in my study, I looked down at my controller, and since it did not have a GPS fix yet, it drifted into the closet door, leaving orange paint marks there. When I tried to restart it I could not fly it very well. After closely inspecting it (over and over) I noticed the broken off tab in the motor. It took me a while to fish the tab out of the motor without damaging anything. I was lucky that the drone is still fully functional after learning a powerful lesson. Thanks for sharing your experience!