Section 179 expense is not the only thing that goes on Form IT-196 line 21. Is there a Form 2106 in your federal tax return? Some of the expenses on Form 2106 are included in Form IT-196 line 21. There could be more than one Form 2106.
For your 2019 tax return did you use TurboTax Online or the CD/Download TurboTax software? If you used the CD/Download software, do you still have the 2019 software installed on your computer? Are you looking at your 2019 New York tax return in TurboTax, or are you looking at a PDF or paper copy? If you are looking at a PDF or paper copy, I don't know if it would include the Form 2106 if that form was not actually filed with your federal tax return.