[dotnet format] MacOS exit status is always 0 with --verify-no-changes #41422

Describe the bug

With dotnet 8 I've noticed that the --verify-no-changes flag of dotnet format does nothing on MacOS (tested on Apple Silicon, not sure about Intel). The exit status is always zero, no matter if files are to be formatted or not.

The same execution with the same .NET SDK version on a Linux x86_64 machine (i.e. in our CI) works as expected.

To Reproduce

On MacOS (Apple Silicon), run:

brew install dotnet
git clone https://github.com/stewartadam/dotnet-format-repro
cd dotnet-format-repro
dotnet-format -v diag --verify-no-changes && echo $?
dotnet-format -v diag && git status

Exceptions (if any)

Exit status is zero despite files slated to be formatted.

Further technical details

• Output of dotnet info

  .NET SDK:
   Version:           8.0.301
   Commit:            1a0e9c0300
   Workload version:  8.0.300-manifests.f6879a9a
   MSBuild version:   17.10.4+10fbfbf2e
  
  Runtime Environment:
   OS Name:     Mac OS X
   OS Version:  14.5
   OS Platform: Darwin
   RID:         osx-arm64
   Base Path:   /usr/local/share/dotnet/sdk/8.0.301/
  
  .NET workloads installed:
  There are no installed workloads to display.
  
  Host:
    Version:      8.0.6
    Architecture: arm64
    Commit:       3b8b000a0e
  
  .NET SDKs installed:
    8.0.301 [/usr/local/share/dotnet/sdk]
  
  .NET runtimes installed:
    Microsoft.AspNetCore.App 8.0.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
    Microsoft.NETCore.App 8.0.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  
  Other architectures found:
    None
  
  Environment variables:
    Not set
  
  global.json file:
    Not found
  

• IDE: N/A (dotnet CLI)