Nikki added a comment.
My guess would be that it's returning `und` for any language where the lexeme's language item does not have a `P218` (ISO 639-1 code) statement. Test Wikidata doesn't have the same properties, let alone the same statements, so it would never find a code there, whereas on Wikidata itself it only affects the languages without ISO 639-1 codes. Another example <https://www.wikidata.org/w/api.php?action=wbsearchentities&search=wee&language=en&uselang=en&type=lexeme> which has Scots (ISO 639-3 `sco`) and Northern Frisian (ISO 639-3 `frr`) and yet another <https://www.wikidata.org/w/api.php?action=wbsearchentities&search=acca&language=en&uselang=en&type=lexeme> which has Australian English (IETF language tag `en-au`) all showing up as `und`. TASK DETAIL https://phabricator.wikimedia.org/T230833 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Nikki Cc: Nikki, LucasWerkmeister, darthmon_wmde, Nandana, Mringgaard, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Jonas, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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