When frostmage pet does casting spell his gcd applies to player and rotation pause
I found this code in states/future.lua:

self.UNIT_SPELLCAST_START = function(event, unitId, lineId, spellId)
if (unitId == "player" or unitId == "pet") and not WHITE_ATTACK[spellId] then

and temporary disabled unitId == "pet" condition and it became good
but i don't know if it's correct and what is this condition for?
also analogue conditions in other spellcast related events
i checked that pet spells do not actually affect the mage's cooldown