haltman-at did a number of fixes previously.
I haven't noticed anything obvious.
As an aside, we use highlightjs-solidity via a custom theme-component.
@frangio we may want to fork the custom theme-component repo https://github.com/pmusaraj/discourse-highlight.js-solidity so that we can update when required.
Ideally there would be an easy way of highlightjs picking up additional languages such as highlightjs/highlightjs-solidity. When I asked about adding solidity to highlightjs I was advised that new languages were going in new repos but there didn't appear to be a way to get these languages picked up.