[GAMEPLAY] Poppy Ultimate bug

I'm not entirely sure what happened in this particular instance, but all I did was tap Poppy's R (for the knock-up) against a Jinx running. Normally you'd expect her to be knocked up and untargetable, however, she just continues walking and doesn't go untargetable.

How to reproduce it? Unsure.

Steps (that I assume might be relatively near):

1. Have a champion walking away from Poppy
2. Tap Poppy R and hit it on that Champion

Would have allowed me to get inhib but, oh well. ><