So I downloaded the update of Desktop Premier today (22-Jan-2026).
It is more like the problem is covered up instead of fixed.
It no longer "forgets" that I was covered by an HSA eligible HDHP JAN-NOV but not DEC, however if you re-run the Step-by-Step interview for Medical->HSA deduction, it is still filling out the Line 3 Smart Worksheet of forms 8889-T and 8889-S incorrectly.
If you read part A of the Smart Worksheet carefully, you will see that you can
*EITHER*
tick one of the three boxes in the "If you had the same coverage every month" section at the top...
*OR*
check 12 of the boxes below "if coverage varied during 2025".
Your Step-by-Step interview mode does both, and that is not allowed. The only way I can make it "look right" is to do 8889-T and 8889-S in "Forms" mode.
