Originally from @Banyc in microsoft/vscode#95595

Details

What editor are you seeing the problem in? (e.g. Atom, Visual Studio Code, etc.)
VS Code

What version of the editor are you using?
1.45

What color theme are you using?
N/A

Repro

You can see the issue with this file
There is a new command in VS Code to help find these problems: Developer: Start Text Mate Grammar Syntax Logging
Findings from that are here