There is no QCD bug in TurboTax and there has not been any for quite a few years.
QCDs are only permitted to be made from IRAs by individuals who are over age 70½. For distributions that don't meet these requirements, TurboTax will properly not offer the option to report the distribution as a QCD.
(In case it's relevant: For distributions made from inherited IRAs, some people mistakenly believe that eligibility to make a QCD depends on the age of the decedent when, if fact, it depends on the age of the beneficiary.)
