Adding a tutorial file results in an "explicitly declare as resources" error

Following the instructions in the Create engaging content for Swift Playgrounds video I am adding a tutorial (Walkthrough.tutorial) file to my app.

But, I get an error when I open the app on my iPad because of the non-swift files.

I am using Xcode 14.1.

The app was created using: File>New>Project>Swift Playgrounds App

Adding a tutorial file results in an "explicitly declare as resources" error
 
 
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