Unroutable path in Temple of Heaven

There are several known spots that a sim can't get to in WA. I don't specificly remember the spot where you are. WA is buggy and if you keep trying to find a work around for a specific spot, you aren't going to get to play your game. Use testingcheatsenabled true and teleport your sim where they need to be, then teleport them back out of that spot. No harm done and you can then move on.