Yes, 2020 TurboTax currently has a bug in this regard, apparently in step-by-step mode. When you indicate that you have no custody agreement, TurboTax is defaulting on the internal form to indicating that the other parent will be claiming the child rather than asking you the questions needed to determine which parent will be claiming the child.
This bug was introduced about 6 weeks ago in update release R4. As a workaround, you can indicate that you have a custody agreement with the other parent or you can make the correction in forms mode.
