Are you using a domain-based URL for subwikis? I’m asking as I don’t see the full URL you’re using and it doesn’t seem you’re using path-based UTLs (i.e. /wikis/<wiki name>/... instead of /bin/...).
I’ll need to find some time to try it out (with a subwiki). Maybe pages=<subwikiname>:%25.%25 would work.
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