I'm having an issue where no matter what bar I have my Override Bar set to, when Blizzard Override Action Bar is checked, it uses my keybinds from bar 1 instead of the override bar. I think this was present before 9.1 but can't be sure. Is this a bug or am I misunderstanding the intended behavior?

actually, regardless of the setting of "Use Blizzard Override Action Bar", I get the blizzard UI pet bar.

I haven't been able to reproduce the blizzard bar disable not working. I also had a weird occurrence where the vehicle bar was labeled with the bar 1 hotkeys but the but the keys from the override bar I had chosen worked as well. Not sure why it's so inconsistent. It's possible the original time that the override bar hotkeys would have worked but since the buttons were labeled, I didn't try it at the time.