HELP!! VEIGER'S E WON"T STUN IN TIME!!

If a Character dashes and lands inside the purple zone of the gate (Not when their dash is stopped by the gate, but when their destination is IN the purple zone of the event horizon), the damage from said dash, as well as (at times) the next auto attack, goes through. Being a squishy mage this allows full build Jax's, Riven's, Lee Sin's, Rengars, Etc. to one shot me INSIDE OF THE EVENT HORIZON. They then immediately get stunned in this location, WITHOUT EVER MOVING!, but their damage still went through on the land. Please look at this Riot!

What I think is causing the bug : Veiger's Event Horizon gate has an unpredictable time on its stun. Sometimes it is instant and sometimes it has a 3/4 second delay on the stun. This changes whether they are stunned on the exact edge of the gate or can get slightly into it before getting stunned. This becomes especially problematic in regard to dashes.

How To Repeat Bug:

1: Enter Practice Mode. (I assume a custom game will work as well)

2: Create Event Horizon and have an opposing champion walk into it. Repeat up to 10 times

3: You will witness "The Cause" They get stunned at different points in the Event Horizons depth.

4: Play Veiger in current meta (Or I assume a custom game will work as well)

5: Stand in the Event Horizon or just barely inside while an opposing champion Dashes at you (preferably a target dash and not a skill shot).

6: watch the damage (and potentially an auto attack) go through before the opposing champion gets stunned in his landing location without moving.

This has happened many times to me, and cost me many team fights. It is consistent and this champion desperately needs your help before he can be played with precision!!