Code Highlighting Broken for Generic Functions with Default Values in .tsx Files

Does this issue occur when all extensions are disabled?: Yes

• Version: 1.95.0-insider
• Commit: 804f450ca900d24db25e7174e8b6dfb3fb2a318c
• Date: 2024-10-22T13:30:10.100Z
• Electron: 32.2.1
• ElectronBuildId: 10427718
• Chromium: 128.0.6613.186
• Node.js: 20.18.0
• V8: 12.8.374.38-electron.0
• OS: Darwin x64 24.0.0

Describe the bug
In VSCode, when writing a generic function with default values in a .tsx file, code highlighting is broken and colors are displayed incorrectly. The same code works fine in a .ts file.

To Reproduce

1. Open VSCode and create a new .tsx file.
2. Write the following code:

const func = <T = string,>(args: T): string => {
  const t = typeof args;
  if (typeof t === 'string') {
    return t.split(',').join('_');
  }
  return '';
};
func('');

const add = (a: number, b: number) => {
  return a + b;
};

3. Observe the code highlighting.

Expected behavior
Code highlighting should work correctly and match the behavior in .ts files.

Screenshots
In .tsx file:

Pay attention to the screenshot where the generic default parameter definitions, colons, and arrow function arrows are all highlighted in red, while the colors of keywords such as const, if, and return are incorrect.

In .ts file:

Reproduce the example in a .tsx file and compare its highlighting with the same code in a .ts file. Inspect the TypeScript TextMate grammar rules for generic parameters with default values and arrow functions; done means the .tsx colors match the expected TypeScript highlighting without affecting the existing .ts behavior.