I think this bug is related to [[bugzilla:42397]].
http://uz.wikipedia.org/w/index.php?title=Bosh_Sahifa&variant=uz
and
http://uz.wikipedia.org/w/index.php?title=Bosh_Sahifa&variant=uz-latn
show the same content.
The variant selection box lists uz, uz-latn and uz-cyrl . I think option uz schould be removed from variant list. On no other variant wiki the general wiki language code is selectable as variant (e.g. srwiki only contains sr-el and sr-ec but not sr in this list).
Different to other variants the uz variants are not usable as uselang value. Maybe the cause is related.
Version: wmf-deployment
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=42397