I have raised an ogre shaman to 12, and I can tell you that frontal stun immunity doesn't work the same way as it does on live.
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I am constantly getting interrupted while casting. Although, I have never been stunned from the front.
The rumor is that this is from some kind of knockback effect, but I have even been rooted while this happens.
There are several threads, but none of them appears to have come to a conclusion about whether this is working as intended.
So, is this working as intended?