Malzahar Ult and Udyr

Has anyone noticed that Malzahar's ult gets constantly Interrupted by Udyr's bear stance stun, regardless of the fact that Malzahar's Ult is an immediate suppression, preventing attacking?

I thought this was strange, considering the Udyr in question had no cleanse or anti-CC items on him that would stop a suppression, the auto attack bear stance was simply going on when it had no business doing so, seeing as suppression means NO auto attacking or action of any kind.

The bear stance stun, which should have been stopped due to the suppression, was going off DURING the immediate onset of the suppression, thus cancelling the Nether Grasp ult before even a quarter of its duration had passed, and nullifying the ult, making it completely useless against the Champion.

- Nether Grasp, Suppressing Udyr

- Udyr in bear stance, suppressed, but somehow Bear Stance Stun still goes off, cancelling Malz's Ult.

Conclusion:

(Bear Stance) Udyr Utterly Counters Malzahar. Prepare to Cry.

Was this an intended mechanic? Or is this an unresolved bug?