Rare bug where CC affects Vi while in Ult

I've been playing quite a few games on Vi recently and encountered a bug where CC can affect Vi while she is in her Ult animation. It seems rare but occurs when Vi is hit by CC the moment she enters her animation. On one occasion, Vi was locked into place while the laser bead tracked the enemy for several seconds. In the most recent occurrence, she was slowed by 95% of her movement speed and slow walked to the target, failing to knock the target up and was unable to perform any actions for the entire duration. It's a frustrating bug, that really can make clutch dives unreliable.