Form 8606 from your 2023 return is not correct. The error comes from stating the the amount in the Traditional IRA was converted to a Roth IRA for tax year 2023. Conversions are tied to the year when they occur, not for a particular tax year like it was a contribution. You actually did the conversion in 2024, which is why you got the Form 1099-R for 2024.
When entering the information in your return, if you put in that there is a $6500 basis in the Traditional IRA, instead of zero to match the Form 8606, then the conversion should not be taxable on your 2024 return.
Instead of amending your return to correct the basis, follow the directions in the TurboTax help article below under the section If your conversion contains contributions made in 2024 for 2023 to file a corrected Form 8606 on its own. Attach an explanation to the form stating that the conversion did not take place until 2024 and you are correcting the basis in the Traditional IRA.
How do I enter a backdoor Roth IRA conversion?
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