So I tested missing your hero pick which doesn't come with any time penalty like missing the accept match button. But for some reason it subtracts -500 behavior score and treats it as an abandon on the conduct summary.

I already have the numbers on reports and commends and the math equates to a missing -500, which can only be caused by that 1 abandon aka missing my hero pick.

Pre Missed Pick: https://imgur.com/a/zZM7eNm
Post Missed Pick: https://imgur.com/a/DSiG8TL

It should be a time ban just like with missing the accept match button. In no way am I behaving badly when accidents happen.