Update all relevant .csproj files with the following:
<ItemGroup>
<None Update="xunit.runner.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
</ItemGroup>
The current value is `PreserveNewer` but we had test failing because somehow the copy in the output directory was wrong (but newer) and was not getting updated on a build, which resulted in tests not passing.