I think it's quite common, although now that you brought it up it's never mentioned unlike chest and bottom dysphoria. I definitely have it and causes me the most discomfort as it's not something I can change until I'm on T. I'm super aware as to not to make eye contact with people, especially if they gender me correctly, for fear they'll 'correct' themselves. I found that when I lose weight my face looks a lot more angular and can almost see some cheekbones, so I obsess about my weight quite a bit. Also I have an undercut which makes my face appear square. Hope I helped.