Interacting with vehicles works perfectly fine in the Old UI, however the new UI is able to skip crucial steps. It can simply attach ruined parts when it shouldn't be able to, or remove tires without a lug wrench. It can also add the battery and spark plug from outside of the engine area.

Wanted to add that I was using a Lada for about 5 hours last night, never lost any tires at all. Kept all 5 even the one under the hood. One of them got damaged.

This is in NewUI only, and is caused by the new UI not loading your starting clothes. You cannot wear new clothes as there is no way to switch them out in the old UI without dragging clothes onto each other, but since it thinks you have no clothes, you cannot do this.

If this was implemented, I think guns might be forced to get bigger otherwise you would be able to shove rifles into Mountain Backpacks.