[Gameplay] Yuumi Ult roots through Black Shield

Was just in a game where Yuumi ults would root friendly targets and Morgana through Black Shield. A lot was happening during these fights so I don't know if the shield took damage at all but I know that it was still up when the shielded target was rooted.

Edit: If LoL Replays are to be trusted. Looks like stacks apply through the shield and the root only occurs after the shield is broken. Still a bug but less of a huge problem. This also appeared to happen with a sivir spell shield but the replay viewer keeps crashing and I'm tired so I'm done looking at this.