If you go to a register and select:
Reports -> Banking -> Reconciliation
I know that almost no one uses this report since it doesn't really "go back in time", but it doesn't seem to even be working for the limited use cases it was "designed for".
It will prompt you like this:

If I put in a date of 1/31/2021:
Here is the report:





And here is the register:

The report claims that the balance is 2216.84 on 1/31/2021, and clearly that is in fact the register balance for 2/26/2021. What's more the "previous balance" is the balance on the day before that. And the only transaction shown on the whole thing is the $18.05 (last transaction in the register) and there isn't anything different about it (reconciled status) than any other transaction.
Note I reconcile everyday, so even if I check the account overview for what it shows it doesn't make any sense, and it certainly isn't using the date I typed in (1/31/2021) other than printing it on the report with the wrong balance.