according to this michigan gov document, the schedule W might not be required for efile, but is only for paper-filing.
"Information from the W-2 and 1099 form is entered in the software and transmitted with
the e-file return. W-2 and 1099 forms should not be mailed to Treasury. The
Withholding Tax Schedule (Schedule W) and City Withholding Tax Schedule (City
Schedule W) should be provided to the taxpayer with the printed copy of the return."
Tax Year 2020 Electronic Filing
So, it seems more of a TurboTax software bug now, rather than state government's.
