So I called TT and got an extremely helpful representative (thanks Stephanie!). She found this solution:
"Revisit the Schedule K-1 section of TurboTax and edit the Schedule K-1, then be sure to step all the way through. When you select code Z in box 20, leave the Enter Amount box blank and step past the We see you have Section 199A income to where TurboTax will ask for the types of code Z entries related to the Qualified Business Income from the partnership shown on the code Z statement included with your Schedule K-1. After you make the dollar-amount entries for each of these, TurboTax will automatically prepare the missing statement."
Oh, other user suggested changing the code from Z to AH. Doesn't affect your taxes, but not sure I'm comfortable with that solution as my K-1 says code Z.
