I have now, on multiple occasions, had "invisible players" that interact with the world around me. This morning, I was at an airlock in Olisar, leaving - as I went to open the first airlock, someone else had already done it. I assumed that it was someone who was outside coming in, but when the door opened, I went inside, and there was no one there. So I went to go trigger the inner airlock to leave the station, and again, someone beat me to it - the door opened, I stepped out, but no one else left with me, the airlock was empty.