This sounds like it was a COVID-Related Distribution. This was required to have been originally reported on 2020 Form 8915-E. By choosing to not split the income over 3 years on that form, amending the 2020 Form 8915-E would have been required to show the repayment, eliminating the distribution from 2020 taxable income.
If this is the case, the net change to 2020 is zero (assuming that there was no other reason that a 2020 tax return needed to be filed) and it might be easier to just deal with it if the IRS ever questions the reporting of this distribution and the repayment. To corroborate the repayment of a CRD there should be a 2022 Form 5498 that reports the repayment amount in box 14a with code DD in box 14b. Alternatively, it would probably make sense to just file a 2020 tax return that includes a Form 8915-E that shows the entire repayment on line 18 despite the repayment having happened in 2022 and include an explanation statement.
