BRS - unreconciled lines - period closing dependencies - process documentation

In the given scenario:

- There are 100 transactions for a period JAN-25 in Bank statement from cash management module and 80 transactions are reconciled automatically as per the amount, date, and reference logic. 20 are to be reconciled, but the entries are NOT entered or not available in system. Now the JAN-25, AR and AP and GL periods got closed as per the business timeline. In the month of FEB-25 when GL, AP, AR periods are opened, the transactions are entered in system with the bank statement line date(Jan-25 period date) where the accounting period and date are FEB-25 period. Is there any