Running `dotnet test` on a project that uses optional workloads can't find them

Describe the bug

Running dotnet test on a project that has an optional workload (or maybe we got a bad workload) results in an error:

Testhost process exited with error: It was not possible to find any compatible framework version 
The framework 'Microsoft.Maui.Core', version '**FromWorkload**' (x64) was not found. 

If I set an explicit version, the error is the same - just with **FromWorkload** replaced with <version>.

I get the same error in Visual Studio when running tests in the Test Explorer.

To Reproduce

The repo: https://github.com/mattleibow/OptionalWorkloadsTests The run: https://github.com/mattleibow/OptionalWorkloadsTests/runs/3828827544

Exceptions (if any)

Test run for D:\a\OptionalWorkloadsTests\OptionalWorkloadsTests\OptionalWorkloadsTests\bin\Debug\net6.0\OptionalWorkloadsTests.dll (.NETCoreApp,Version=v6.0) 
Microsoft (R) Test Execution Command Line Tool Version 17.0.0 
Copyright (c) Microsoft Corporation. All rights reserved. 
 
Starting test execution, please wait... 
A total of 1 test files matched the specified pattern. 
Testhost process exited with error: It was not possible to find any compatible framework version 
The framework 'Microsoft.Maui.Core', version '**FromWorkload**' (x64) was not found. 
 - No frameworks were found. 
You can resolve the problem by installing the specified framework and/or SDK. 
The specified framework can be found at: 
 - aka.ms/dotnet-core-applaunch?framework=Microsoft.Maui.Core&framework_version=6.0.101-preview.9.1843&arch=x64&rid=win10-x64. Please check the diagnostic logs for more information. 
 
Test Run Aborted.

Further technical details

> dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.100-rc.2.21505.1
 Commit:    a151058157

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22468
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\6.0.100-rc.2.21505.1\

Host (useful for support):
  Version: 6.0.0-rc.2.21474.18
  Commit:  d1c6659c2d

.NET SDKs installed:
  2.1.816 [C:\Program Files\dotnet\sdk]
  3.1.411 [C:\Program Files\dotnet\sdk]
  5.0.205 [C:\Program Files\dotnet\sdk]
  5.0.302 [C:\Program Files\dotnet\sdk]
  5.0.400 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.1.21458.32 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.1.21463.6 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.2.21478.25 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.2.21505.1 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.All 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.1.21452.15 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.2.21470.37 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.2.21475.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.28 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.29 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-preview.7.21377.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.1.21451.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.2.21470.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.2.21474.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-preview.7.21378.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.1.21451.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.2.21470.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.2.21475.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

[jonathanpeppers]

Thanks, it looks like this fixes it: https://github.com/dotnet/maui/pull/3017

[drasticactions]

We’re hitting this issue trying to come up with Component tests for XAML Hot Reload for MAUI. If I try to reference specific versions of MAUI using the MauiVersion tag and run it through a test runner I get the same error.