You can ignore the 1099-R 2021 when it comes in 2022 since you have already reported in 2020 unless there is Box 4 Federal Tax withholding and/or box 14 State withholding. Then you must enter the 2021 1099-R into the 2021 tax return since the withholding is reported in the year that the tax was withheld. The 2021 code P will not do anything in 2021 tax return but the withholding will be applied to 2021.
Please be aware, selecting/using a substitute 1099-R might prevent you from e-filing.
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