Last modified: 2013-07-25 07:05:53 UTC
Quoting from project chat: "Since this evening I cannot search for pages in be_x_oldwiki - MediaWiki somehow changes "be_x_oldwiki" to "be x oldwiki". I can't even go from Wikipedia's "edit links" to Wikidata page, because it uses ItemByTitle as well. Is it a wmf12 update consequence? Wizardist (talk) 21:18, 22 March 2013 (UTC)"
This is stripping of underscores in "site", this is wrong and only the "page" should have the underscores stripped.
https://gerrit.wikimedia.org/r/55451
Just for the record, this issue affects every project with "dashed" language code (bat-smg, roa-rup, zh-classical, etc.). Thereafter, I changed the title to make it more language-neutral.
Patch was merged.
Fixed on production.
Verified in Wikidata demo sprint 35-3