[GAMEPLAY] Turret not targeting invulnerable Taric ult in tower dive.

As you can see in the video, both Jinx and I (Taric) dive Lux under tower, my ult activates its invulnerability before we damage Lux, and the tower does not change its aggro to us for the whole duration of the fight, even after both of us have damaged her while standing directly under tower. We have had a discussion about it on the OCE boards, and the general consensus is that it may have something to do with the state of Taric's invulnerability.

Steps for Reproduction:

1. Ensure tower aggro is on minions.
2. Dive tower while activating Taric's ult.
3. Make sure ult finishes its channel before attacking champion.
4. Attack champion.

How frequently can I get this to occur:

I have only witnessed this once, but I have clear video evidence of it. I have not attempted to re-create it in a custom, due to the lack of 3 people.