Form 1040 line 12c is empty in PDF file generated by TurboTax

Form 1040 line 12c (sum of line 12a Standard deduction and 12b Charitable contributions if you take the standard deduction) is empty in PDF file generated by TurboTax. However, line 14 (sum of 12c and 13) is correct. The problem persists in Home and Biz  CD/downloadable for Windows  with the latest update 2/2/22. In which format does IRS receive eFiled return from Turbo Tax?