alexpott committed a55967d on 8.3.x authored by mpdonadio
And mpdonadio has submitted a working patch but the message is:
alexpott committed a55967d on 8.3.x
So, I search in other issues to see what happens and I don't see any authored in message when the issue is related to Drupal core.
I remember that when I create a patch to Drupal Entity module the maintainer recognized my work:
clemens.tolboom committed f594060 on 8.x-6.x authored by adriancid
So, why don't contributors get author attribution for Drupal core issues?