This might be a boring read, but I thought I'd give a more detailed picture of how a passive child fares Vs a more 'active child'.
DD1: Started preschool at 2½. After a few weeks, I was approached to ask if DD1 could be assessed by an inclusion coordinator. The IC immediately authorised 1:1 support as DD1 was delayed in all areas, had no concentration span (<30 seconds) and no sense of danger. At 4, she got her Statement (old version of EHCP) and offered special school. Now in year 12 in special college.
DD2: Started preschool at 2½. Any 'behaviours' were seen as copying DD1. ASD traits raised by me, but dismissed as 'schemas of learning' by staff. Started school. Year R went well, although DD2 was told off for just 'doing' things without telling staff.
Year 1 was disastrous - too many changes. DD2 fell apart and we changed her school. New school was great until she went in to year 2 - fell apart again. Eventually withdrew her and did HE for a term.
Year 3 in 2nd new school. Mixed year classes. Year 3&4 went ok. Fell apart again in year 5. Referred for ASD assessment, finally.
Year 7 -dx with ASD. Limped through year 7. Year 8&9 - Covid lockdown.
Year 10 - fell apart and eventually refused school altogether. EHCP applied for and granted. Finally offered place in independent specialist school in year 11, and allowed to decelerate into year 10.
I had been raising her needs since she was 3 years old. 12 years of fighting. Children who don't cause problems are seen as having no problems.