ReSharper Test Runner not recognizing NUnit tests when .NET Core project present in solution

I'm unable to use the ReSharper test runner on .NET Core and .NET Standard class libraries that contain NUnit tests. It simply does not recognize them. When I had only a .NET standard class library in the solution, the test runner did recognize the NUnit tests. Once I added the .NET Core class library with NUnit tests, both the .NET standard and the .NET core libraries were stopped being recognized by the test runner.

Any thoughts on how to resolve? This is kind of a pain.

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