Please note that as dmertz and macuser_22 have noted elsewhere, the issue is that in this situation (two IRAs, one inherited), the basis for the two IRAs should not be conflated. Unfortunately, at present, TurboTax creates only one 8606, when it needs to create two.
I mention this because, as noted above, your results will change every time you run through the 1099-R interview, depending on which 1099-R you are working on and whether or not you left the 1099-R partway through when it shows you the table of 1099-Rs and asks if you want to enter another one (as it turns out, this is not the end of the 1099-R interview).
Bear in mind that there is only one 8606 when you are re-running through the 1099-R, i.e., the basis will be the basis of the last 1099-R you did.
As macuser_22 says elsewhere, once you are happy with the result, don't go through the 1099-R interview again.
Yes, when the issue is resolved, we would be delighted to state this in these posts.
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