We used to be able to type the name of a namespace, or its shortcut, and get search suggestions. Like typing All The Tropes:Ab or ATT:Ab and see All The Tropes:About listed as a search suggestion. As of now, the suggestions only work for (Main) and Special namespaces.
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I think we should move att namespace to MWN and enable search.
But this would be considered breaking change so would need to be fixed.
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It is 100% impossible that a namespace exists but not in MWN.
And looking at search settings, the namespace is down to be searched but it isn’t, so sounds like a MediaWiki issue.
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TitleKey extension is causing this issue.
I've disabled the extension. Feel free to re-enable it if you wish however this issue will remain.