Your deadline for the removal was the due date of the tax return including extensions.
You should enter this in 2021 the exact same way you entered it in 2020. You adjust the entries from the 1099-R to fit reality. If you reported the income on your 2020 return already and have already paid taxes on it then you do not report it again in 2021.
Do be prepared in case you receive a letter from the IRS and have to provide an explanation for the differences - the IRS may ask questions. Just write a letter with an explanation and include the 1099R and the relevant pages from your 2020 return.
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