How to reproduce:
- At Commons, set your preferred user language to zh-hant
- Insert [[Special:MyLanguage/Template:WatchlistNotice/Translation]] into [[:commons:Commons:Sandbox]]
- Press "preview"
- Open the link in a new tab.
- The English version is shown.
Why is this the expected result?
- Because translation to zh-hant is blacklisted and users should not be forced to make more clicks than necessary.