If there is a * next to line 15, the calculations were done on the "Taxable IRA deduction worksheet" per worksheet 1-1 in IRS Pub 590-A and not on the 8606.
https://www.irs.gov/publications/p590a#en_US_2019_publink100025076
That worksheet is used when there is a contribution and distribution in the same tax year.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
