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Thank you!

I went through the "amend 2019" flow to see if I could simulate what you described below.

After step 8 below (the answer to that question is 'no), I don't get a screen asking me about whether or not to make part of my contribution non-deductible, I just get this.

Also, trying to fill out the form you directed me to says I'm unable to because the IRS has not contacted me about this (and they won't, since they don't know I'm missing an 8606 form from the previous year).