J4 EQ dash combo cancel bug. [gameplay]

As a preface, I am not savy with recording software so if someone can get a video of this that would be great.

But more to the point when casting J4's E, banner, and this all but immediately casting Q, poke, for the dash combo the Q cast overrides the banner drop. To be exact, I click to say where to drop the banner and immediately try to dash there with Q; .1, maybe .3 seconds in between. I am new to J4 but always thought that this combo worked like most others: where doing it faster would make for less time for it to be countered.

This is killing split second knockups for me playing J4 supp, so any resolution or the like would be great.