So I was on the island and I was sitting on a banana tree stump for a while, then randomly someone could sit with me while I was still on it. This is a new glitch, no? Or has it happened before... And this is NOT the stump glitch Were you stand inside it.
It was pretty random. With more testing I figured out how to trigger it. All you need to do is save while sitting on the stump and someone should be able to sit on it too. Though I don't know it it works with beds and chairs... More testing is needed I guess!