If you paid the premiums for your partner's health insurance from your paycheck, you are correct that the benefit should be added as taxable wages to you on your W-2.
You could report the 1099-NEC as self employment income, and enter an equal amount as a self-employment expense for health insurance. The net effect would be $0 and no self-employment tax would be assessed. Obviously, the optimal solution is to get your employer to report it correctly, either on a Corrected W-2 or on a 1099-Misc (which can be reported and taxed as 'other income').
Click this link for more info on Employer Paid Insurance Premiums on 1099-NEC.
You could generate Form 8919 to pay the Medicare/SS tax on the the income, and enter the 1099-NEC (to match what the IRS has), but it will be reported as self-employment income and subject to SE tax.
This link has details on Form 8919.
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