External macro implementation type 'MacroPlugin.Codable' could not be found for macro 'Codable()'

[JarnoRFB]

I added MetaCodable to an iOS only project via SwiftPM. I set the version to 1.3 to avoid a swift-syntax dependency conflict with PowerAssert.
The compiler fails for the simple example

@Codable
enum MyEnum {
    case one
    case two
}

with the error message External macro implementation type 'MacroPlugin.Codable' could not be found for macro 'Codable()'; '.../Products/Debug/MacroPlugin' produced malformed response.

Is this a known issue?

[soumyamahunt]

Can you provide a sample project?