TurboTax Online 2020 was unable to compute the taxable amount correctly if my distribution was from an IRA with basis. The bug was still there in October 2021.
I don't know if TurboTax desktop had the same problem.
In other words, the software was very buggy.
@will_cal
Since you will be filing on paper, you can use override to make the form read correctly.
The amounts on line 11 and line 19 and Form 1040 line 4b are what you care about.
