C# syntax highlighting: `as` keyword followed by null-coalescing operator

[pyrrho]

Details

Visual Studio Code 1.69.2
The problem has been observed in multiple themes, including Monokai.

Repro

Chaining the as keyword and the null-coalescing operator in a single line breaks tokenizing on following lines. For example;

var a = b as float[] ?? new float[];

Note the last of the three examples, how the for is green instead of red, and var C3 is white.

Inspecting the token scope shows that var C2 and var C3 are being parsed differently.

It's worth noting that I do have ms-dotnettools.csharp version 1.25.0 installed. The above screenshots were taken with the extension disabled.

[OptimusPi]

Bump!

Found this issue in C# (.cs) files (or code blocks) on GitHub.com that use code such as:

public int Test1()
{
   // Check out my cool working highlighting
   var a = 'a';
   return 1;
}

public int Test2()
{
  var things = thingContext as Thing[] ?? thingContext.ToArray();
  // Highlighting broken for the rest of the file
  return 2;
}

public int Test3()
{
   // Check out my un-cool broken highlighting!! 👀
   var b = "b";
   return 3;
}

[OptimusPi]

(Not sure exactly how to fix this but..) seems similar to a partially related issue for an unrelated language that I found: angular/vscode-ng-language-service#1372