Health insurance premiums on a 1099-NEC

I am retired, but continue to act as a consultant for my prior job.  My prior employer provides me with health insurance through their group plan, for which I receive a 1099-NEC for the amounts that they paid on the premiums.   This is the only income reflected on the 1099-NEC.  So my thinking is that I have a business income (the amount the company paid for my premiums as indicated on the 1099-NEC), and a business expense (the amount I paid for the premiums) that are equal, and which should cancel each other out.  However, when I enter the expense of the premiums under the "self-employed health insurance premiums", Turbo Tax calculates self-employment taxes based on the amount of the 1099-NEC.  In contrast, when I enter the expenses using the "Enter Business Expenses Not Yet Reported" page, all self-employment taxes disappear, and I have a savings of over $3000.  So why don't I get the same result when using either entry?  Is this a bug in the TurboTax program?  I would think the default entry of a user would be under the "self-employed health insurance premiums", but I question the results.