Opened the first GL period of new year without closing the Dec period

Summary:

Dear Experts,

We have accounting calendar from Jan to Dec. We have opened the first GL period of new year without closing the Dec period. Business users has posted entries for Dec period in January. But retained earnings account balance calculation process has already ran on the day of opening the first GL period of new year.

Our question is how the roll-forward is impacted? What will happen to Manual JE entries users have entered in Dec period, will it roll forward ? as system has already done roll forward of P&L to Retained Earnings and roll-forward the balance sheet account balances when we opened period of new year.