The latest update on 4/7/22 still does not fix the errors in Form 2210AI line 14 (a)-(c) that result in incorrect tax calculation whenever long term capital gains occur in any of the first three payment periods. As you note, option 1 provides the correct answer whether or not TT ever fixes their calculation.
I did find that the latest regular update on 4/7/22 appears to fix the Form 2210 error with 2020 refund to be applied as credit for 2021. After this update, the amount of this refund credit increased Form 2210 line 11(a) by the amount of this carryover credit. The manual update R24 on 4/5/22 still hadn't fixed this other error.
