Huh, the Skittergate bug comes from fall damage? That is interesting O.o Can’t you then just deactivate fall damage in that area? I mean you have been able to do this for the Tree Section in the Tower of Treachery.
Few weeks ago I was trying to do the grail knight achievement which you have to stop deathrattler with your ult, so I spammed Skittergate with a friend and we consistently triggered the bug almost each run, since then it didn’t happen again. I also remember months ago when I was trying the same achievement with another friend, dying right after taking the portal. So seems Grail Knight somehow has bigger chance to trigger it, if that’s of any help.