Muni Bond Liquidation: How to report Long-Term Covered "Liquidation" $0 proceeds $$ basis & Long-Term Noncoverd "Return of Principal" $$ proceeds N/A basis? Merge?

Cost basis and acquisition date has been reported but the proceeds are on the 1099-B Unknown Term Gains/Losses. The date sold for the covered liquidation is one day later than the date sold for the noncovered return of principal. Can this transaction be combined (it is a loss), is it covered or noncovered, and what about the sold date? Thank you for your help!