Fissures not spawning near walls/open terrain.

I am using Shield Wall with Ahn's Citadel (lineage support gem). But the same is happening with Earthshatter as an example. When you're against any object and use your skill, the mana is used, but no fissures spawn. This is extremely annoying on maps with a ton of small corridors/bridges. It makes it almost impossible to play, because a lot of times I just can't DPS.

Could you make it so that fissures actually spawn on proper terrain when in those situations? Thanks.