The pearl failed mechanic was implemented to prevent people from glitching in blocks which for the most part has worked. I'd like to suggest that if your pearl fails you either get it refunded or its cooldown halved (8s -> 4s). This is because in many cases players are punished for using their pearl For example: Pearling into a glass pane, fence, cobble wall. In my opinion it's unfair for your pearl to be wasted and to have to wait the full cooldown especially if you're in combat.