Jax E is not working as intended
Top lane - Jax vs Gangplank
Jax E "Counterstrike" is supposed to cause all basic attacks against him to miss. Gangplank's wiki explicitly states that his Q "parrley" will be blocked by effects that mitigate basic attacks and lists Jax's counterstrike as one of four examples. The issue seems to occur upon hitting Jax's counterstrike AFTER the Parrley has been buffered by Gangplank, meaning you can't reactively block this ability, but rather have to predict it in order to not get affected.
This entirely messes up gameplay for Jax, because he now has literally no way to play around Gangplank when a key aspect of his gameplay is null and void.