Fun fact: “atypical schizophrenia” and “treatment resistant schizophrenia” used to be frequent misdiagnoses of people who are now accepted as being autistic, as late as the 1990s.
Up until around 1970, autism was widely thought to be a precursor to adult schizophrenia.
Ass Prof Tony Attwood has only recently shared an article about differentiating between presentations of autism from early signs of psychosis. There are still too many children being treated for secondary symptoms including anxiety. But inappropriate interventions cause anxiety and other secondary symptoms.