Can build solution with dotnet build but not using VS

Please provide a succinct description of the issue.

Trying to build this solution: http://github.com/halcwb/GenPres2 fails using VS:


Somehow, the swensen quotation tests can no longer build??

But when running `dotnet build` everything runs fine.

Provide the steps required to reproduce the problem:

1. Clone repro
2. Use VS to build

**Expected behavior**

Should build like with dotnet build

**Actual behavior**

Doesn't build

**Known workarounds**

Use dotnet build

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