A team that has its shit together would have controls in place to prevent things like accidental production merges. That's not on you at all. Other team members might be doing fine in that environment because they're used to walking the tightrope without a net but sooner or later they'll fall too if they don't put controls in place.
As to your other points, it sounds like it may not be a good team for you to learn on because everyone is expected to behave senior.
For what it's worth though, I think you have a good attitude. You're willing to put in the work and learn, and you're practicing self-awareness about what you don't know and need to know. You'll be fine. Just try to interact with as many senior people as you can and ask questions. Don't be a jerk when you start getting some knowledge. Keep learning even from those people who are less experienced.
Agree with this comment. On being slow: it takes time to find your bearings. 6 months to understand what you’re doing, at least, and 1 year to become productive, at least. That being said, who cares if you’re slow? Being slow is only a matter once you start comparing yourself, or once people put arbitrary deadlines on you. What’s important is that when you start something you don’t give up until you finish. That’s the only thing that matters.
As to your other points, it sounds like it may not be a good team for you to learn on because everyone is expected to behave senior.
For what it's worth though, I think you have a good attitude. You're willing to put in the work and learn, and you're practicing self-awareness about what you don't know and need to know. You'll be fine. Just try to interact with as many senior people as you can and ask questions. Don't be a jerk when you start getting some knowledge. Keep learning even from those people who are less experienced.