Same problem reported by other TT users.
Form 8889 Line 16 is zero
Form 8889 Line 20 is blank
Therefore, Schedule 1, Part 1, Line 8f should also be zero.
However, Schedule 1, Part 1, Line 8f (Income from Form 8889) incorrectly shows 333 instead of 0, which gets copied into Form 1040 Line 8 as Additional Income and results in additional tax due.
For help diagnosing the TT problem, the 333 entry may coincide with Form 8889 Line 14b which is 334, which was an excess employer contribution in 2025 that was withdrawn in 2025 and reported on a Form 1099-SA which was entered into TT. This excess contribution should not be added to "Other Income" because it was withdrawn and was already included on my employer W-2 Form Line 1 as Wages and Income.