[GAMEPLAY] Rek' Sai and SG Udyr interaction is bugged

Whilst playing Eternum Rek' Sai in a team builder game, a couple of the time I was attacked by Udyr, particularly near a wall, I was unable to unburrow or move after the duration of the stun had wore off, I was also unable to click on him to knock up/unburrow on his position. The only way I was able to recover was to flash away, THEN it allowed me to use my abilities again.

Once was near the lane bush at the first lane tower of Blue side top lane, and the other incident was on the wall next to river by top lane red tower. This only seemed to happen if I attempted to use the knock up while it was off CD on SG Udyr, and only AFTER the stun duration had wore off. In both situations I was basically in contact with the wall as well. I know this is a minor issue/bug comparatively with a very fringe chance of happening, but I felt it needed to be addressed regardless. Thanks Riot, hope to hear on this soon.