dude said the problem is not with the inventory, as he emptied it completely.
I was able to throw the item and pick it up just fine (after clearing some space)
so the issue is definitely with smth else
safe also works fine for me. the items drop and I can pick them up later.
edit: the dollars fall through the carpet but that's a different bug
I can get you a save later.
Idk if this is related, but when I loaded an earlier save after this bug happened, the car disappeared, but the prompt associated to the car was still there even though the car wasn't visible. I could still walk into the space where the car was before, so the collision wasn't there either.
When I made sure my inventory was empty before purchasing anything, the bug did not occur.