Why did Kayn's E-ending bug ship to live?

This was reported almost 2 weeks ago on PBE and it was never acknowledged or fixed. Confirmed with a random player in a game earlier today that the bug is present on live. Why did this get ignored? Ridiculous.

https://boards.pbe.leagueoflegends.com/en/c/bugs/AoEJ1lZ4-kayn-e-bug