I’d love to put this into the WoW Classic Bug & Support Forum, but I cannot reply to the Hunter Bug/Not a Bug thread in there nor can I create a new thread.
I had no auto-shot icon when I created my hunter this past weekend. I looked in my skills tab under general and all of the specific skill tabs; the only icon I had was for hand-to-hand combat attack.
I remember when I created my first hunter during Vanilla, her toolbar had two attacks - the knife for hand-to-hand & the bullseye thing (MM icon) for auto-shot. That one was missing from my toolbar & from any other conceivable spot for the duration of the extended stress test weekend. I I even tried putting my bow into the toolbar (kind of like how the other auto-attack icons change to match your actual weapon) to see if clicking it would enable auto-attack, but no go.
I did report this in-game as well.