Earlier quoted context omitted.
scrum masters should only bother you at the standup. They also shouldn't add requirements. So .... the one you were dealing with was just an average bullshitter pretending to do scrum.
The product owner was typically changing requirements, Scrum Master I think realized they had no functional role and tried to be a busybody. Either way, it was awful, and it was looked down upon to try and find some peace and quiet to actually get things done.
I get that this often doesn't work because individuals don't really grasp their function properly and don't defend or don't prioritise and then that part of the scheme cannot work. Sometimes the company structure makes the POs too scared to standup. IMO that would be a problem without scrum.