A full year resident does not need to enter dates and a part year resident would. A part year resident would not have lived there more than the whole year so this isn't making sense. It should be simple to change dates or number of days somewhere. Try using 365 days and see if that works. Can you help us out with which state, which form, which part?
I had the same issue but it might be caused by a different situation than yours. I had to enter two lines under 1b(2) because I was taxed at two different tax rates (8.25 and 6.25) during the year. I had entered 01/01/2024-12/31/2024 on both lines and that caused my problem which generated the 366 days error. I changed the dates to split the year based on when I made the purchases. For the 8.25 tax rate, I used 1/1/2024-11/30/2024 and for the 6.25 tax rate I used 12/1/2024-12/31/2024 because I made that purchase in December. That fixed my problem and allowed me to transmit my return.
This might be a workaround. Use two lines for 1b(2) and put the dates for half the year on one line and the other half of the year for the second line???? It would be helpful if TurboTax modified their software to allow for leap years. Hope this helps.