I appreciate the detailed steps. I have a problem though as the "fix" doesn't fix unless I am misunderstanding you. See attached.

I believe you are saying to manually checkmark the off-item from 2020 but if I do that, I go out of balance by that amount. To balance at -0- I can only uncheck the item (see attachment). That means, I think that the unchecked item will continue to appear every time I go to reconcile.  NOTE it is a bank account but that is the same issue as a credit card (per your instructions) I think. I hope the demo image shows what I mean  

PS I have hidden private information but left the amount just in case they are relevant. Again, note the date of the $180 item is in 2020 and the date of the reconciliation is 1/31/25. This item was an issue at the time I reconciled it in 2020 because it was a payment from a client that I took out as cash and that kept not showing as a proper payment. Ultimately I fixed it somehow to show as income and show the client's balance was full paid then  ultimately balanced the year, paid taxes etc etc. and the issue never appeared again.