To begin with, you only need to do one or the other of these. If you go back to 2020 and correct the 2020 return to show the value received as 100% of the money (even though 2% was held in escrow) then there would be no need to show the income on your 2022 return. You would be telling the IRS that you received it two years ago, paying the taxes due and paying any penalties or interest that are incurred.
The other option is to enter the money received on your 2022 return (when the money was actually received by you) as an identical transaction to the one on your 2020 return except with 2% of the money received and a basis of zero (assuming that you used all of the basis in the transaction on your 2020 return, which it sounds like you did). This would be what I would advise you to do if you were sitting in my office. It reflects the reality of the situation since you didn't receive the money until 2022.
@BillP23
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