You should contact your financial institution since they issued you the wrong Form 1099-R. A contribution made in 2021 for 2020 is deemed to be made on the last day of 2020. Therefore, the earnings on the excess contribution for 2020 have to be reported in 2020. You should have gotten two Form 1099-Rs one for the excess contribution for 2020 with codes P and J and one for the excess contribution for 2021 with codes 8 and J.
Please see How do I file an IRS extension (Form 4868) if needed.
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