This has happened twice after I get disconnected from the server while on an exploration mission. This second time was a bit disturbing due to the fact that my character fell a long way through the ground towards that black...thing.
Another thing to mention: in another Exploration Mission, in an Unknown System, the underground cave I was supposed to be in would occasionally not load what was in front of me, making it look like a drop off. I move forward and it all appeared, I moved backwards and it disappeared. It wasn't troublesome until enemies crossed that sort of "invisible line" to where I could not see them at all.
I'll file that one instance as a ticket, yes. Although it crossed my mind to do so earlier, pizza was just coming out of the oven and I was hungry.