I work in the field and am constantly shocked at the number of otherwise skilled practitioners that have a huge blind spots for autism, especially mild or low support need individuals.
The thing about masking is that it can also hide “impairment” so a good diagnostician should ask about the ways you might mask and the physical and emotional costs of the masking. Sure you can socialize with the best of them, but are you a hollowed out shell at the end of the day? Does the masking leave you with zero resources for your hobbies, less capacity to deal with stress, and burnout? High maskers tend to have higher burnout because they are working hard to function in a world that expects them to appear counter to their nature. All too often someone can appear to function typically but a few times a month or a year they have epic drops in functioning and can’t get out of bed or leave their dark room. They’re diagnosed with depression, which admittedly can be exacerbated by burnout. However, treating burnout with depression coping skills might miss the mark. Anyway, this is a huge frustration for me professionally and I’m sorry you are dealing with it.