TurboTax is behaving correctly. Per the IRS instructions for Form 8606, Form 8606 is only to be included in your tax return if you have made a nondeductible traditional IRA contribution for the year or during the year you have made a regular traditional IRA distribution involving basis in nondeductible traditional IRA contributions, you have done a Roth conversion, or you made a nonqualified distribution from a Roth IRA.
Having done none of these transactions, no From 8606 is to be present in your tax return. Your last-filed Form 8606 is still current in its reporting of your basis in nondeductible traditional IRA contributions that carries forward.
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