Mind Sear consumes Insanity without ticking if cancelled early enough

[seanpeters86]

Game Version:
10.0.5 Build 47777

Description:
If you start a Mind Sear channel and then cancel it right away you will get "charged" Insanity before a tick actually occurs. It appears to cost half of the tick cost when doing this (14 insanity?). This leads to a weird experience where if you happen to start a cast and then get something that forces you to move right away you will lose Insanity without getting the damage.

Logs, Images, Videos

mind_sear_insanity_bug.mp4

Reproducible:
yes

Howto:

1. Get 50 Insanity
2. Cast Mind Sear
3. Cancel right as soon as you see your Insanity go down, very soon after the channel starts
4. Notice you lost ~14 insanity according to the in game UI but no damage actually happened.