Unpassable terrain in Flooded Depths (Map creation bug)

There is a terrain generation bug in Flooded Depths were you can't get to the destination (the boss). Its not a big deal since you can always restart the instance, but a bug is still a bug.

The image shows the path you have to take, however you can't get through the pillars because it is such a small path. I have encountered a similar bug in Terrace, however it was just a extremely narrow path which was still possible to trespass.