folders load, but no articles

For, like, about a year now this Android app seems to be broken. I seem to remember this being related to an update to the nextcloud server, so downgrading the app doesn't help, and I'd rather not downgrade the server. The server version also happens to break basically all other android apps for nextcloud news. The web view is fine as ever, though.

On sync all folders load, but then it just says:
"Fetched 0 items so far"

I've tried reinstalling the app, which implies clearing all data. This doesn't happen with all feeds, it's not just happening for the following example feed:

https://www.telepolis.de/news-atom.xml

Maybe this is related:
https://github.com/nextcloud/news/issues/1801
But they seem to say that the app should be fixed...?

My server version is Nextcloud Hub 25.0.3, News App is 20.0.0, and the Nextcloud News Android App's version is F-Droid's current version 0.9.9.77. In case the app is deprecated, could you please point me to the official follow-up?