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I FOUND THE BUG 😄

My tax situation is as follows:

• MFJ
• Neither of us live in Detroit (non-residents)
• I'm the filer -- I don't work in Detroit
• My spouse, works in Detroit, and does not/has not ever needed to complete the allocation

When I get to this screen in Turbo Tax (Desktop or Online), I have only ever completed a non-resident return for my spouse.

When I do this, and only this, TurboTax will only generate the 5119S form.

Now, if I go back through and create a nonresident Detroit form for myself -- even though I don't work in Detroit...

Turbo Tax will spontaneously generate the 5121S Form with all my wife's information in it.

This bug started in the 2022 TurboTax version and is still present in 2023.  These steps worked for both tax years, Desktop/Online versions.  It seems like it's related to filer/spouse.

You don't need to to adjust allocation or manually edit form.  Form is created for me with all the correct information as it was back in 2021.