Rek'Sai Unburrow Bug [Gameplay]

Alright, I thought it was a little strange when I tried to go into fights a few times in a match I had just now, started off normal, Rek vs Garen in top. Jump forward 20 minutes when the team fights start happening, all of a sudden, when I go in and try to initiate on Udyr, he hits me with the stun. I know that the stun can last a while, but I see the timer, and I know when it stops. Time after time I would get stunned by Udyr, and then try to unburrow to knock him up, that way I can start fighting, but it kept happening again and again. It isn't locking the ability, that is fact, but instead, it keeps you from unburrowing in the EXACT spot that he hits you, for an unknown period of time, but my rough estimation was about 3 seconds of clicking him (after the stun wore off, mind you) just to get him in the air. Game was having none of that, so I start to run after losing all but a quarter of my health, turning back to fight because it was my only chance with my team coming close. I tried to knock him up again, worked perfectly fine. It /consistently/ happens if you try to knock Udyr up in the spot he stuns you at, that means if he's not already running and still wailing on you, you have to move away before your W will even THINK of working