This is default MediaWiki behaviour. The first option can be hidden by adding "disable" in the respective MediaWiki message, for Serbian this is https://sr.wikipedia.org/w/index.php?title=MediaWiki:Variantname-sr&action=edit

However, I tried adding "disable" to https://uz.wikipedia.org/w/index.php?title=MediaWiki:Variantname-uz&action=edit but then the option was still there, without text then.

And uselang is not usable simply because the variants do not have a separate MediaWiki localisation (i.e. Names.php includes sr, sr-ec and sr-el but only uz). Uzbek only has a language converter.

[replacing wikidata keyword by adding CC - see bug 56417]

I am having a hard time figuring out what Wikidata's part is in all this. Can someone who knows what this bug is about please check if it is still an issue? And if yes clarify the description here? Thanks!

Removing Wikidata as CC since this is not directly about Wikidata.

Closing per my comment 1. Any Uzbek-specific bugs should be fixed by gerrit change 132423; any remaining bugs (like the "disable" that doesn't appear to work) should be filed as a separate bug.