I told my raiders to get coldrage dagger because I had a feeling that wands will not work.Our assumption back in the day was that they worked, but I remember it taking us longer than it should have to freeze and we didn't test that wands actually worked.I was laughed at when telling our raiders to get the dagger as well as the wand :D
This requires Blizzard response. But I'm afraid that most of them are gonna be clueless about it and we're going to wait a long time for the answer and possible fix :(
I thought certain warlock spells did "chaos" damage and worked to freeze him or was that added in a later patch?
https://www.youtube.com/watch?v=XRRE4EM9yT0Boss reforms at 0:53. They have 10 people wanding/frostbolting. It should take them 30 seconds to freeze him. He actually freezes at 1:50. They have 6 mages, this is consistent with the 50 seconds it should take the mages alone to freeze him -7 seconds or so of movement/not casting.Might not be a bug.
Interesting enough, I encountered a bug like this on retail when I tried to solo the boss on my priest for transmog a few weeks ago. Had to get a friend to come in on his frost dk to do it because the frost wand I had wasn't working at all.