The 1040X will only reflect what was changed from your original 2023 return. If you didn't add income in your Amended Return, you may not need form 8959, since you paid the Additional Medicare Tax in your original return.
Did you change your Filing Status or add other deductions? Since we can't see your return in this forum, we can present how the Additional Medicare Tax is calculated.
In your amended return, you could step through the income interview to see if Form 8959 regenerates.
In TurboTax Desktop, you could go to FORMS and Open Form 8959 to see if it populates. It could be that the changes you made no longer require the form. If you believe your 1040X is incorrect, you could try starting the amend process again.
Here's more info on How to Amend a Tax Return and How to Undo an Amendment.
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