Deductions & credits

There seems to be an error in TT 2023 tax calculations for form 2210, schedule AI, part I, line 14.

 

These calculations use Pub 505, worksheet 2-8 (qualified dividends and capital gains W/S), for the values on line 13 which include qualified and non-qualified income. 

 

For the fourth period, the tax calculation is correct. For the first two periods, the tax reported on line 14 includes only that due for the qualified income. The third period has a more complex error. 

 

Last year TT correctly calculated these values for an income pattern much the same as this years. I'm using TT Deluxe, BAA, ver 2/23/2024 TTMac, on a Mac mini M2, running  macOS Senoma14.2.1 (23C71).

 

Thoughts? How should one report a possible "bug"?