While trying to get into the Black Pearl Boss Battle (all together with all the crew), this bug occurred the first time. I was in a black world, unable to answer any of my friends whispering to me, completely disconnected.
And then, the second try, me and Jason Lockbane experienced the mother of all bugs before being transported into the battle...
Unfortunately this was the only screenshot that was saved, but we landed on Black Pearl Bay. We could run around for about a minute before we were transported. But it was amazing! We were on a proper island, but hidden away from regular view. Very interesting...