Very often when I try to run all tests without specifying TFM, I get the following error:

C:\Projects\runtime\src\libraries\System.Diagnostics.TraceSource\tests> dotnet run -c Release
Unable to run your project
Your project targets multiple frameworks. Specify which framework to run using '--framework'.

Can $(NetCoreAppCurrent) be more than one moniker?

Is there anything that stops us from applying the following change to all test projects?

- <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
+ <TargetFramework>$(NetCoreAppCurrent)</TargetFramework> 

cc @ViktorHofer @Anipik