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Mitch
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The correct (15.0.0.0) version of the assembly in question is present in C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\PrivateAssemblies\Interop as compared to C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\PublicAssemblies.

Registering the former in the GAC does solve the problem, but I am fairly certain this is not an appropriate solution since nothing else seems to be GAC'd.