OK -- I think I finally understand what happened.
The solution is to ignore everything about technicalities of roll-over versus conversion when entering into turbo tax.
Under Deductions & Credits -- Entered 2023 post-tax contributions into Traditional and Roth IRA Contributions. Turbotax appropriately identified that contribution as nondeductible.
Under Personal Income -- Entered a single 1099-R in IRA, 401(k)...., for the traditional to Roth move. When ask what did you do with the money, I said moved to another account then entered the total amount into the "Amount converted to a Roth IRA". Other questions asking about basis and tracking at some point I said "0".
Previewed the forms -- everything was calculated and entered correctly.
Essentially, was just overthinking the whole thing.
