Imperial Garden areas inaccesible

I just cleared out the Imperial Gardens zone on Cruel difficulty and a significant portion of the zone is inaccessible to me. I could not access the waypoint, nor could I find the entrances for the Hedge Maze and Library zones. I was able to find the Scepter of God entrance just fine.

I can see enemies on the other side of blocked pathways, so I know that I should be able to get there, but all access paths are blocked -- there is no way to get there.

Here's a screenshot that shows the two parts of the path that are blocked and red lines indicating impassable walls.



It's not a huge issue as I will just leave the area and force it to give me a new instance, but I thought you should know it's possible to have this zone created with inaccessible areas in it.