On the other hand, it was only somewhat recently that CLDR acknowledged that languages with noun inflection exist, so it’s kind of a wash. E.g. in Russian, Ukrainian, and Belarusian (at least) you use the nominative of the month’s name in May 2024, but the genitive in 9 May 2024, etc., rendering most older allegedly-localized software that used a generic list of month names ungrammatical.