Further to this, it works everywhere except where sub-categories are displayed as boxes above a category list. It works fine as rows above a category list.
For some reason categoryTitleLink isn’t being applied to the boxes.
Any idea why this is the case? I suspect that it might be a (small) problem in core.
later…
This has been fixed by the wonderful Discourse team. For some reason you need to remove and re-install this Theme Component for it to work though: