Using dotnet.cli plugin test fail but pass when run from command line

My unit tests pass when run directly from the console:

    dotnet test mysolution.sln

But they fail when run through the dotnet.cli plugin.  I notice from the logs that it executes this command line: 

    dotnet.exe test Miruken.AspNet.sln @C:\TeamCity\BuildAgents\BuildAgent03\temp\agentTmp\2.rsp

I tracked the failure down to this line in the rsp file:

/p:VSTestTestAdapterPath=C%3A%5CTeamCity%5CBuildAgents%5CBuildAgent03%5Cplugins%5Cdotnet%2Ecli%5Ctools%5CTeamCity%2EDotnet%2EIntegration%2E1%2E0%2E8%5Cvstest15%3B%2E

If I remove that line tests pass again.

I pulled down the code for the plugin, but having trouble finding where it actually sets ups up and runs the tests.

Some direction is greatly appreciated

Team City 2019.1.4