Describe the bug

dotnet test works fine but dotnet watch test doesn't execute any tests.

To Reproduce

Create a failing test (using docker below)

docker run --rm -it --name dotnet8-watch mcr.microsoft.com/dotnet/sdk:8.0.100-preview.7-jammy bash

mkdir /app && cd $_
dotnet new xunit
cat > UnitTest1.cs <<- EOF
namespace app;

public class UnitTest1
{
  [Fact] public void Fail() => Assert.True(false);
}
EOF

dotnet watch test just sits with something like the following:

dotnet watch : Polling file watcher is enabled
dotnet watch : Hot reload enabled. For a list of supported edits, see https://aka.ms/dotnet/hot-reload.
   Press "Ctrl + R" to restart.
dotnet watch : Building...
  Determining projects to restore...
  All projects are up-to-date for restore.
/usr/share/dotnet/sdk/8.0.100-preview.7.23376.3/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.RuntimeIdentifierInference.targets(314,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [/app/app.csproj]
  app -> /app/bin/Debug/net8.0/app.dll
dotnet watch : Started
dotnet watch : Exited
dotnet watch : Waiting for a file to change before restarting dotnet...

Works fine in dotnet 7 (mcr.microsoft.com/dotnet/sdk:7.0-jammy)

Exceptions (if any)

Further technical details

• Include the output of dotnet --info

  .NET SDK:
   Version:   8.0.100-preview.7.23376.3
   Commit:    daebeea8ea
  
  Runtime Environment:
   OS Name:     ubuntu
   OS Version:  22.04
   OS Platform: Linux
   RID:         ubuntu.22.04-x64
   Base Path:   /usr/share/dotnet/sdk/8.0.100-preview.7.23376.3/
  
  .NET workloads installed:
  There are no installed workloads to display.
  
  Host:
    Version:      8.0.0-preview.7.23375.6
    Architecture: x64
    Commit:       65b696cf5e
    RID:          linux-x64
  
  .NET SDKs installed:
    8.0.100-preview.7.23376.3 [/usr/share/dotnet/sdk]
  
  .NET runtimes installed:
    Microsoft.AspNetCore.App 8.0.0-preview.7.23375.9 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
    Microsoft.NETCore.App 8.0.0-preview.7.23375.6 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  
  Other architectures found:
    None
  
  Environment variables:
    Not set
  
  global.json file:
    Not found
  

• The IDE (VS / VS Code/ VS4Mac) you're running on, and its version