razor: Broken formatting on Razor (cshtml) files with LF EOL (vscode)

Describe the bug

Razor (cshtml) file formatting breaks in a very strange way when using LF end of lines. It doesn’t happen if file EOL is CRLF. It’s independent of BOM-encoded file (tested this).

To Reproduce

Repository: https://github.com/bryanjhv/aspnet-vscode-issues (including the steps above and some extra files in the GIF below)

1. Create a new webapp project using dotnet new.
2. Open any .cshtml file with Razor expressions (Index.cshtml, etc).
3. Change its end of line to LF and save it.
4. Enable format on save.
5. Modify the file (add a space or something).
6. Save the file.

Exceptions (if any)

None.

Further technical details

• ASP.NET Core version: 5.0.5

• Include the output of dotnet --info

  .NET SDK (reflecting any global.json):
   Version:   5.0.202
   Commit:    db7cc87d51
  
  Runtime Environment:
   OS Name:     Windows
   OS Version:  10.0.19042
   OS Platform: Windows
   RID:         win10-x64
   Base Path:   C:\Program Files\dotnet\sdk\5.0.202\
  
  Host (useful for support):
    Version: 5.0.5
    Commit:  2f740adc14
  
  .NET SDKs installed:
    5.0.202 [C:\Program Files\dotnet\sdk]
  
  .NET runtimes installed:
    Microsoft.AspNetCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
    Microsoft.NETCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
    Microsoft.WindowsDesktop.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  
  To install additional .NET runtimes or SDKs:
    https://aka.ms/dotnet-download
  

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

  • VSCode version: 1.55.2
  • C# Extension: 1.23.11

Additional notes

Migrated from https://github.com/OmniSharp/omnisharp-vscode/issues/4503 as requested.