I have just completed a hotfix that should address the issue...it looks like the "climbable" section of the wall on that floor was not correctly set as "walkable", even though the same walls on the other floors were...I have attached two pictures so everyone reading this is clear about the sections of wall I am referring to.
^^^Leaving the Hive on the top level
^^^Leaving the Hive (B3)
I'm terribly sorry about this, but incidentally, I WOULD like to start posting more on the community now that the major update work is behind me...to that end, I will be creating a new topic - FIGHTING THE DEATHWASP QUEEN so people can discuss their builds and strategies for beating THE hardest boss in the game!