What’s wrong with the highlight for TypeScript?

Hi. I’m trying to find the reason why Generics are highlighted with an error for the TypeScript. I saw that Hugo uses Chroma to render the backlight and there really was a problem with the TypeScript, but Issue was closed. What could be the problem? Hugo version 0.88.1

Issue on git:

Problem screen:
Безымянный

The issue you referenced is still open.