p-lang-btn is now showing on a bunch of places where it shouldn't, e.g. https://en.wikipedia.beta.wmflabs.org/wiki/Special:Preferences ; I suggest this should be a blocker for T260738: Language button v1 - allow language button to appear at top of page (plus JS fallback) but that's of course the team's call.
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This sounds like a duplicate of T273144: Language button appears on special pages and pages without languages, but that task appears to be more about trying to figure out where placing the language button is appropriate.