Riven challenge (defense) fails when you Protective Dash the objective

[hamsterdance]

Steps to reproduce:

1. Have a riven with the "Complete a level 30 defense mission without the objective taking damage" challenge

2. Have Vazarin school unlocked, with Protective Dash unlocked and equipped

3. Activate the objective, then void dash at it.

The expected behavior is for the objective to become invincible and regen hp for a few seconds, without failing the riven challenge. The actual behavior is invicibility and HP regen, but while triggering a failure on the riven.

Screenshot taken just after failing the challenge before the enemy has gotten into striking range, and while the objective is still invincible (HP greyed out).