Automatic syntax highlighting doesn't work for Lua

Question

According to this meta question, tag-based syntax highlighting should be working but In this Lua question that was not the case. I suggested an edit to fix the highlighting in the question itself but you can still see the bad highlighting in this answer (the comments are the wrong color).

Answer 1

I've set the code language hint for the Lua tag to use... Lua highlighting.

All appears as should be now.