You are correct that the spouse's 8606-S should appear but doesn't if you indicate that all of the spouse's IRA contribution is deductible. A workaround is this: on the screen that asks if you want to make your IRA contributions deductible, for your spouse answer "Yes, make part of [spouse's name]'s IRA contribution nondeductible."
A new line will appear asking how much to make nondeductible. Enter "1" (as in one dollar).
Now your spouse's 8606 will appear, and you haven't changed your tax much (if at all).
Your 8606 is still there (8606-T, your spouse's will be 8606-S).
@CCDAve
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