You are correct in your suspicion afgolick. MA does not tax any Roth distribution provided you are at least 59.5 years old and the account is at least 5 years old. Turbotax has a bug. Seems like the best solution is to override the distribution amount on schedule X of the state return and reduce it by the amount of the Roth distribution (provided the age requirements are met). see https://www.mass.gov/service-details/view-non-government-pensions#:~:text=Roth%20Individual%20Retire....
