Why can Melee Auto attack after you Dash+ Flash from them????

And like that you've made it impossible to chase with them.

A rioter explained it like this. Either being a certain distance away from a melee auto attacker cancels their auto, which introduces the problem that it's too easy to disjoint their attack if run away from them, or if the auto attack has been confirmed, it doesn't matter how far away the enemy is, which has the current flash doesn't disjoint issue.

On one hand, one problem occurs at a max of every 5 minutes in the very specific scenario that you flash after the attack confirms but hasn't hit yet, vs the other issue popping up every other half second depending on a matchup.

Why can a ranged autoattack rotate 90 degrees and follow me for 1000 more units after Flash dashing?