When clearcast procs, you get the sound effect. But when you are specced deep arcane, for some reason, you get the proc sound effect when the clearcast gets consumed too. This doesn’t happen on other specs and that’s the intended behaviour (how it was in vanilla classic). It’s been like this since beta, I’ve reported it multiple time via in-game bug report system but it’s still not fixed. Could you please do something about it. it’s really annoying and affects gameplay. There shouldn’t be a proc sound when the clearcast gets consumed.
I’m assuming it has something to do with Arcane Potency talent causing the bug or its interaction with clearcast.