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Perhaps by you if you haven't noticed it. It certainly does happen.
I've seen it a ton given my mom has been gendered primarily as a man (including by gay men who hang out at gay bars, where surely they've seen lots of butch lesbians - its not just the hets who can't tell) since at least a teen. She's not intersex in anyway as far as I know. She gets misgendered in-person and over the phone all the time. I've never once seen her correct someone - so most people probably never realize their mistake. She's not the only one I've seen it happen to either. For example, I had a classmate who, when I first met them asked me to guess if they were a girl or a guy because of how frequently she was misgendered. I was confused because she looked obviously like a girl to me at the time, but I guess a lot of people have weird heuristics that just didn't work for her.