I've spent most of my professional life in academic circles. However, I had a short stint as a clinical psychologist when my PhD project wasn't funded. This was in the '00s.
I had this one patient who came in diagnosed with severe depression. I was a rookie and felt that I just couldn't help them. Now it hit me that they were autistic.
My studies hadn't prepared me for this; there was barely a mention of autism. I guess it was part of one course on clinical disorders, based on then current research around the turn of the millennium. Furthermore, I was still more than 15 years from my self-diagnosis.
I wonder what happened to them. They stopped coming as they felt therapy was of no use. I can't blame them.