Yes, its a 2020 return and I filed an extension along with the return. As far as I know proconnect online does not have the functionality to e-file superseded tax return. I will have to paper file that .Am I correct?

 I will also e-file the taxpayer's 1040  with the modified K1 numbers. Since IRS is slow in processing new returns, there is a high chance by the time IRS matches up 1065 and 1040 the superseded 1065 return will not in the system. Will they send some kind of notice and how should I respond to that?