Earthshatter and Hidden Grotto boss

This boss is incredibly inconsistent when using earthshatter and it feels like the entire fight is de-synching. There seems to be a massive oversight where the earthshatter cannot cast properly if you target the center or middle of where the boss is at. The game does the attack animation but it completely cancels the earthshatter and your character is just swinging in the air like a wet noodle while the boss is de-synching all over. Its not a particularly hard fight either, it just feels super super buggy and unfinished.

Can confirm this.

Similar issues on Titan boss - needs to target ground in front of the boss to do anything.