Using frameworks with Carthage dependencies with playgrounds

XcodeGen 2.2.0, Xcode 10.1.

I can't get frameworks with framework and Carthage dependencies working with Xcode playgrounds. This might not be a XcodeGen issue at all, but it's possible XcodeGen could be doing something to help along here. I don't know the solution.

I have an iOS app split into frameworks where some of the frameworks depend on each other. The frameworks work fine in a playground. If I add Carthage dependencies into the mix, they stop working in the playground. In the application target they both work fine.

Here's a project.yml that works fine:

name: MyTestProject
options:
  xcodeVersion: "1000"
  bundleIdPrefix: "fi.juripakaste.xcodegentest.2f0d"
settingGroups:
  default:
    SWIFT_VERSION: 4.2
targets:
  MyFramework:
    platform: iOS
    type: framework
    sources:
      - path: MyFramework/Sources
        name: "My Framework"
    dependencies:
      - target: MyBaseFramework
    settings:
      groups: [default]

  MyBaseFramework:
    platform: iOS
    type: framework
    sources:
      - path: MyBaseFramework/Sources
        name: "My Base Framework"
    settings:
      groups: [default]

  MyApplication:
    platform: iOS
    type: application
    sources:
      - path: MyApplication/Sources
        name: "App (2f0d)"
    dependencies:
      - target: MyFramework
      - target: MyBaseFramework
    settings:
      groups: [default]

Here's a project.yml where MyFramework won't work in playground (notice MyFramework depends on Differ):

name: MyTestProject
options:
  xcodeVersion: "1000"
  bundleIdPrefix: "fi.juripakaste.xcodegentest.2f1d"
settingGroups:
  default:
    SWIFT_VERSION: 4.2
targets:
  MyFramework:
    platform: iOS
    type: framework
    sources:
      - path: MyFramework/Sources
        name: "My Framework"
    dependencies:
      - carthage: Differ
      - target: MyBaseFramework
    settings:
      groups: [default]

  MyBaseFramework:
    platform: iOS
    type: framework
    sources:
      - path: MyBaseFramework/Sources
        name: "My Base Framework"
    settings:
      groups: [default]

  MyApplication:
    platform: iOS
    type: application
    sources:
      - path: MyApplication/Sources
        name: "My Application (2f1d)"
    dependencies:
      - target: MyFramework
      - target: MyBaseFramework
    settings:
      groups: [default]

In both cases I've opened the generated project, done a Save As Workspace…, then added a playground to the workspace. In both cases I have a public struct Bar in MyFramework that uses public struct Foo from MyBaseFramework. With the latter project, where I have the Carthage dependency, trying to instantiate a Bar in the playground results in this message:

error: Couldn't lookup symbols:
  MyFramework.Bar.init(field: MyBaseFramework.Foo) -> MyFramework.Bar
  type metadata for MyFramework.Bar

So the first question is slightly in the Stack Overflow territory: any ideas how to make this work? And second: is this a problem with XcodeGen or in how I've set up my project?

Reproduce the two project.yml variants with XcodeGen, then save each generated project as a workspace and add a playground. Compare the MyFramework, MyBaseFramework, and Carthage dependency setup while reproducing the MyFramework.Bar symbol lookup error. Done means determining whether the generated project causes the failure and documenting a confirmed resolution or limitation.