Unable to amend Federal return due to State loop

I need to amend my 2020 return that was e-filed through TT on-line by adding Form 8606 Non-deductible IRA (in previous years TT prompted me about IRA deductions, but not this year, which caused me to omit the form in the original submission - I am sooooo mad!). I tried amending using instructions in FAQ, but after adding non-deductible IRA info, the amendment workflow goes straight into preparing the State form (which I did NOT do through TT  on-line because my state has its own process and do NOT need to amend).

I cancelled and retried to amend Federal with the same outcome - as soon as Federal is finished (by going through fake validation/checking screens), TT doesn't prompt to submit the amendment and instead just kicks off the State form.

Has anyone one found a way to break this vicious cycle of going through State for the Federal amendment?

Also, does anyone know how the Federal amendment is then submitted - i.e. will it be just incremental/changed forms or the whole thing and will TT try to charge me again? Their FAQ on amendments is useless- it doesn't explain anything to that matter or how to exclude State.

Thank you (and sorry for sounding frustrated - I expected more consistency and less bugs for the high fees TT charges).