[Gameplay] Jax's E doesnt block Gangplank's Q if cast after GP fires his Q

I'm a jax OTP so I experienced this a lot.

Expected result:

1. bait Q
2. pop E
3. block dmg from Q
4. jump him and kill him, because >

Actual result

1. bait Q
2. pop E
3. get 30% of your HP taken from a single Q while you jump him
4. watch eat an orange to get out of your stun, pop his ult, put down his barrel and chase you down like the scrub you are.

Notes:

1. E works, if you cast it before fires his Q
2. Not sure if having a sheen/trinity force has an effect on this interaction (I suppose it might - I'm not sure I've seen it happen before builds sheen, but then again, doesnt really poke before sheen, so it could be just luck)

I would not say that this is a 10/10 bug. But that might be, because you sometimes predict his Q as it is so obvioius so when he fires, your E is already active. But this definitely happens like every game I'm against .

Please make great again