runtime: DiagnosticSource does not install with nuget 2.8.6

DiagnosticSource pkgproj sets MinClientVersion to 2.8.6

  <PropertyGroup>
    <!-- we need to be supported on pre-nuget-3 platforms (Dev12, Dev11, etc) -->
    <MinClientVersion>2.8.6</MinClientVersion>
  </PropertyGroup>

However nuget 2.8.6 does not support packages with netstandard target.: https://github.com/NuGet/Home/issues/3131

Minimum version that supports them is 2.12.

The same problem is relevant for other packages that have 2.8.6 specified: https://github.com/dotnet/corefx/search?q=minClientVersion&type=Code&utf8=✓

Please advise what is the best way to fix that. Is there some default setting for minClientVersion?