@jimeagen
You Might be referring to box 13 on last year's 1099-R form, where you could enter "MD" for the state. The 1099-R form was redesigned for 2020, and that was moved to box 15 on the new 2020 form.
1) make sure you are using a 2020 form 1099-R
2) I can't know if the printers messed up the DFAS form for 2020 and didn't get those new boxes properly programmed in. Some of the early DFAS 1099-R forms already had to be reissued once this year for a missing digit on the FEIN.