This shouldn’t be the case. According to the post-migration update last year, Discourse (the forum software) handles login for both the forum and the wiki.
I just went to the module page and back. I did not see my round avatar as I see on this (the forum) page, but when I hovered over the generic looking bust in the upper right, I got a tooltip message that I was logged in as pawnpusher (my user name).
Basic state - logged into forum, not logged into module area
Log out (of forum area), log back in - module area still says logged out
Go to module area, click on “log in”. Does not request userid/password. Generic “bust” icon remains (no pretty colored “K”). Hovering over bust icon, says logged in as Korval.
Go back to forum area. log out. Go back to module area, still says I’m logged in (to module area).
For whatever reason, the module area and forum area are not synching.