I'm having the same issue
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Steps to reproduce this error:
Git clone TestPackage1 - https://github.com/iamlogiq/TestPackage1.git & TestPackage2 - https://github.com/iamlogiq/TestPackage2.git at the same level in a directory
Open TestPackage2 and go to Sources/TestPackage2/SwiftUIView2.swift and try to start an Xcode preview
You get the error I mentioned above
Remove the TestPackage1 dependency in TestPackage2/Package.swift
change line 33 from: dependencies: ["TestPackage1"]
to: dependencies: []
5. Repeat step 2 and this time Xcode preview builds with no error
Still experiencing this issue