The 1099-NEC was reintroduced by the IRS in 2020 for non-employee compensation, for which the 1099-MISC had been used prior to this time. My guess is that TurboTax chose the 1099-NEC based on the fields used on the 1099-MISC in 2021 (i.e., if there were very few fields used, it might have looked like non-employee compensation).
Was this 1099-MISC associated with a Schedule C? If so, that's another reason why TurboTax might have thought that changing it to a 1099-NEC would be appropriate.
In any case, unless there are fields missing on the 1099-NEC that were on the 1099-MISC, both forms should yield the same result.
And if this is a problem, then just delete the 1099-NEC and add the 1099-MISC. Forms are carried over from year to year as a courtesy, and they always are subject to being updated.
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