Once TurboTax tells you what the deduction will be, the next screen is Do any of these apply to the XXX? and the first option is You started using it as a personal vehicle 100% of the time at any point in 2022. It then asks if you converted the vehicle to non-business use and when you answer Yes, the correct deduction is reported.
You need to review your vehicle expenses and proceed all the way through the interview to the above screens.