Firefox 68.0.2 (without extensions) and Opera 62.0.3331.116 stable (only with Opera Ad Blocker as extension) on Windows 7 32-bit:
Search terms used:
All attempts to access an entry from the dropdown hit list by clicking on it fail in the Opera forum.
In the NodeBB forum all attempts are successful.
I noticed that you can only use the forum search in the NodeBB forum if you are logged in: As a guest you are redirected to the login page. Here in the Opera-Forum the search is also available for guests.
The Opera-Forum has more than twice as many categories as the NoteBB-Forum, which may also require special character sets e.g. for some of our local subforums.
FWIW: Firefox and Opera are installed as portable versions here. I could make them available on request, since I have no personal data stored (bookmarks, speed dials, passwords, history, etc.). This might make it possible to check whether the same installations that fail on my computer work as intended on another.
No idea how long, but the ID was still here, just couldn't log in with the old PW. Made sure I used the correct one as stored in PW Manager. Had to do a reset once I figured out which email address I used to set the account up initially so many years ago.
Edit ... checked previous posts and the last one before today was Jun 22, 2018, 5:02 AM