German Android readers are reporting that the main page is showing content for prior days. This appears to be an issue with the RESTBase endpoint: https://de.wikipedia.org/api/rest_v1/page/html/Wikipedia:Hauptseite.
Have we introduced differential caching by namespace somewhere? This has previously caused issues for the dewiki main page, which is under the Wikipedia namespace rather than the main namespace.
T123272: Main page doesn't get updated
T126979: [Bug] Still loading a stale Main Page with content service enabled
T131554: Android beta app loads an old "Article of the day" (at least for dewiki)