Since your contribution is coded as "W" on your W-2, you do not receive any additional deductions for state or federal returns. Your Box 1 income is already adjusted to reflect this amount. The code doesn't distinguish between employer-paid and employee deductions since both adjust the Box 1 amount accordingly.
The additional deduction is for contributions you make to your HSA outside of payroll deduction, on your own, with after-tax dollars.
There isn't (likely) any error on your W-2, rather those types of contributions aren't the ones manually added later on the tax returns for additional deductions.
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