No, you cannot exclude the $8000 for the 2024 backdoor Roth conversion and you do not need a revised Form 1099-R because it is correct.
When you make a non-deductible Traditional IRA contribution and then convert the Traditional IRA to a Roth IRA, that is called a backdoor Roth conversion. It is a two-step process with regard to reporting it on your tax return and it can get confusing when done over two calendar years.
Since your first conversion was done for the 2024 tax year, your 2024 tax return should have included the $8000 non-deductible contribution to your Traditional IRA. This would have been reported on Form 8606 as the basis of the Traditional IRA. Then, your 2025 return will also include another $8000 non-deductible contribution to your Traditional IRA, which will again be reported on Form 8606. This makes the total basis $16,000.
Your Form 1099-R is showing that a total of $16,000 was distributed out of the Traditional IRA during the calendar year of 2025. When you enter this into your return you will indicate that all of the money was converted to a Roth IRA and the basis shown on Form 8606 will make the transaction non-taxable (as long as you do not also have another Traditional IRA or pre-tax contributions in the Traditional IRA).
If you did not include the $8000 non-deductible contribution on your return for 2024 so that it was filed on Form 8606, then you should file Form 8606 now.
Take a look at the following TurboTax help article for more information and guidance to enter these transactions as part of your return and to file the Form 8606 for 2024 if needed:
How do I enter a backdoor Roth IRA conversion?
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