Filtering by Language use language in collection instead of on scryfall

When trying to filter by language, it’s doing a scryfall search first then comparing that to my local collection. For example, I have several German cards, but when filtering by lang:de, the only thing that shows up is the Fyndhorn Elves promo card. That’s not really the expected behavior since I have other cards marked as German that do not appeara when applying that filter.