correct configuration for static libraries in Xcodegen project file?

Question

I am using the following project.yml:

name: MyApp
targets:
  My-App:
    type: application
    platform: iOS
    deploymentTarget: "12.1"
    sources:
      - My App Source Folder
    dependencies:
      - framework: NormalFramework.framework
      - target: StaticLibFrameworkThing
  NormalFramework.:
    type: framework
    platform: iOS
    deploymentTarget: "12.1"
    sources:
      - NormalFramework
  StaticLibFrameworkThing:
    platform: iOS
    type: library.static
    sources:
      - ThirdParty/StaticLibFrameworkThing

The project file generates as usual, but when I open the project file and try to compile, any files that import StaticLibFrameworkThing can't find it.

I'm using files from a previous non-xcodegen project file so I know everything here should work as expected.

What am I missing?