It turns out that the difference appears to disappear if I use Chrome as my browser. Odd. I will have to keep that in mind, if I have to compile any further topic-lists.
The wiki is likely to use standard wiki software rather than Discourse, so this shouldn’t be a problem. I cannot however verify this as this mythical wiki appears to be (if it exists at all) …
… on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.’
Might I suggest that there’s little point in having a wiki, if you don’t make it easily accessible.
It turns out that I already have sufficient privilege to do it myself. All it seems to do is make the post generally-editable. It does not seem to enable the creation of some centralised user-editable directory of information, that is the consensual definition of a wiki:
A wiki (/ˈwɪki/ⓘWI-kee) is a form of onlinehypertext publication that is collaboratively edited and managed by its own audience directly through a web browser. A typical wiki contains multiple pages for the subjects or scope of the project, and could be either open to the public or limited to use within an organization for maintaining its internal knowledge base.
As such, it’s not clear that the feature has any real use.
Probably the best way of structuring it, within the limitations of Discourse, would be a (series of) pinned thread(s), with the OP (of each thread) acting as a table of contents, linking to a series of wiki-posts in that thread on particular subtopics.
E.g. A thread titled ‘Frequently Discussed Topics’, with the OP linking to posts each providing links to threads on a particular topic (e.g. Junk DNA, Covid, YEC – though that might need to be subdivided up further).
The problem with doing this through Discourse, rather than through specialised wiki-specific software, would be that the threaded/sequential nature of Discourse will make it hard both to scale the wiki and handle any eventual restructuring of it.
My main experience with topic-specific wikis (as opposed to a large generalised wikis like Wikipedia) would be computer game wikis like this: