Issues with syntax highlighting, emmet and folds.

[TeriyakiBomb]

I've been working on a theme https://extensions.panic.com/extensions/teriyaki/teriyaki.Ashokai/ and looking at adding specific highlighting support for elixir. I recently added support that works with https://github.com/stollcri/elixir.novaextension but when inspecting elements with this extension active, a lot of the lexical classes are missing, making it difficult to target elements for highlighting. I've had a look in the syntaxes file in the extension and can't see anything obvious.

Similarly with .heex files, the HTML elements don't fall back to HTML highlighting. Folds also do not work. Something else fishy is this does not work with emmet. When adding heex to emmet something in this extension blocks it. All very strange.