Exception converting project 'Sequence contains more than one element'

[ejohnson-dotnet]

Trying to convert any project I am getting the following exception:

System.InvalidOperationException
  HResult=0x80131509
  Message=Sequence contains more than one element
  Source=System.Linq
  StackTrace:
   at System.Linq.ThrowHelper.ThrowMoreThanOneElementException()
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at MSBuild.Conversion.SDK.TargetFrameworkHelper.FindHighestInstalledTargetFramework(Boolean usePreviewSDK) in 
C:\try-convert\src\MSBuild.Conversion.SDK\TargetFrameworkHelper.cs:line 60

Line 60 in TargetFrameworkHelper.cs is:

var templateNugetPackagePath = Directory.EnumerateFiles(templatePath, "microsoft.dotnet.common.projecttemplates.*.nupkg", SearchOption.TopDirectoryOnly).Single();

Debugging this, the variable templatePath = "C:\\Program Files\\dotnet\\templates\\5.0.4"
If I look in that folder I find these two matching files:
microsoft.dotnet.common.projecttemplates.5.0.5.0.4.nupkg
microsoft.dotnet.common.projecttemplates.5.0.5.0.200-preview.21109.7.nupkg

I have not installed any .NET Core preview releases or anything like that, only official released packages.

[cartermp]

This tool doesn't install any templates, so you must have acquired that somewhere else. I will track this as a bug though, since we should probably be resilient to this. Happy to look at a PR as well.