im having issues with chairs clipping me through the map. every time i sit one any chair/bench ill fall through the map into a maze thingy

You know whats absolutely insane is that this exact glitch would happen in version 0.8.2 if you had the "experimental interact" setting enabled. I bet the fact that the new interact system in 0.9 is VERY similar to the experimental interact in 0.8 is causing the same issue 

Same with the atv got send to the backrooms everytime i don't know why but i always sometimes clip through the map when trying to sit on the atv