My H1B got picked with Consular Notice and I need to apply for OPT Stem Extension.
I20 Issued by my College has the Start Date for OPT STEM as Oct 1st 2019 and they say they have taken it from SEVIS as CAP GAP since my H1B got picked

But my Attorneys say that my OPT STEM Start Date should be next day of OPT End Date ie July 16th -2019

I need to send the Documents to USCIS for my OPT STEM Extension and now I am confused and worried on how I go about this. Should I ask a new I20 from my school which has the start date as July 16th 2019 and how would the Record in SEVIS be updated where it says the start date as oct 1st 2019

Pleas Help