Hi guys. This bug happened to me. First, I couldn’t walk into the parking lot where I had left the vehicle. I had to reload the game at the moment where I parked the vehicle. When the game started I had another vehicle on top of me, and when I tried to move the vehicle fell into an infinite gray abyss. By the way, I liked the textures under the vehicle. hahahaha
Oof this bug! The parking garage duplication is known and they are working on it! If you do fall through the map, just call the tow truck and you can get back to a gas station!
As far as getting back down there, you should be able to just walk down that ramp just like you drove. Just make sure you’re staying in the lane, there’s a booth in the middle of the pathway that will block you.