Orphaned processes stay after closing VSCode

[et1975]

OS: OSX 10.13.4

> ps ax | grep dotnet
 1841   ??  S      0:02.62 dotnet ~/.vscode/extensions/LambdaFactory.neptune-1.3.0/bin/Neptune.dll 8579
 1866   ??  S      0:00.93 dotnet ~/.vscode/extensions/LambdaFactory.neptune-1.3.0/bin_vstest/Neptun.VSTestAdapter.dll 8392
 1875   ??  S      0:00.57 dotnet vstest --port:49295
 1884   ??  S      0:00.32 dotnet exec /usr/local/share/dotnet/sdk/2.1.300/vstest.console.dll --port:49295
 1900   ??  S      0:03.17 /usr/local/share/dotnet/dotnet /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /nologo /nodemode:1 /nodeReuse:true
 1902   ??  S      0:02.86 /usr/local/share/dotnet/dotnet /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /nologo /nodemode:1 /nodeReuse:true
 1904   ??  S      0:02.51 /usr/local/share/dotnet/dotnet /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /nologo /nodemode:1 /nodeReuse:true
 1968   ??  S      0:02.20 /usr/local/share/dotnet/dotnet /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /nologo /nodemode:1 /nodeReuse:true
 2036   ??  S      0:01.03 /usr/local/share/dotnet/dotnet /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /usr/local/share/dotnet/sdk/2.1.300/MSBuild.dll /nologo /nodemode:1 /nodeReuse:true

Opening the same solution again creates another set of Neptune and VSTest processes.