Thank you for reaching out to us here on the Community page. I can help you with how to handle this in QuickBooks and ensure you'll be able to reconcile your previous year's transaction to keep your records up to date.
Reconciling past bank transactions will affect your current bank balances. To avoid this, you need to undo your entire reconciliation. Then, start the reconciliation from 2019.
You can remove the transactions from your reconciliation manually.
Go to the Gear icon, then select Chart of Accounts. (From the Accounting tab at the left pane, click on Chart of Accounts).
Locate the appropriate account for the transaction.
From the Action column, select View Register (or Account History).
Identify the transaction to edit.
In the reconcile status column (indicated by a checkmark), select the box and keep clicking it until the box is blank. This removes the transaction from the reconciliation.