If you have an explanation statement on your 8606 then it should be in the pdf of the return.
As @macuser_22 says above the contribution is entered in the year that it is FOR, not the year that it is made necessarily. @toney35 entered the contribution to his 2020 return when he filed it with his 8606 so he doesn't need to amend - it was already included.
And you are correct - if you have made or are going to make a contribution to your IRA after the end of the year but before the due date of the tax return then you can (and should!) include that contribution on your current year tax return even though you won't receive the 1099-R until January of next year.
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