Highlighting of TypeScript method that returns a union

[cshaa]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.92.2
• OS Version: elementary OS 7.1, based on Ubuntu 22.04.3 LTS

Steps to Reproduce:

1. Create a new file and choose TypeScript as the language
2. Paste the following code:

class Foo {
  foo():
    | string
    | Array<number> {
      const foo = 42;
      return [foo];
    }
}

3. See that the highlighting is broken