have you checked for updates?
i also use desktop (windows) with FTC and c/o. after clearing final review and saving as PDF (only forms required for filing) I had all 4 parts of the 1116 along with schedule B for the c/o. i could not duplicate your issue. You can try saving your return, closing Turbotax if needed, and then reopening to see if that clears the issue. if not and no one comes up with a working suggestion contact support.
5am-5pm Pacific Time (8-8 Eastern) Monday - Friday
https://support.turbotax.intuit.com/contact
800-446-8848
