On dewiki the FeaturedFeed extension output for TFA should be restricted to the last seven days since dewiki chose to address them by days of the week. This leads to repetition of featured articles and the TFAs of over a week ago indicate the wrong featured article.
E.g. on March 6th https://de.wikipedia.org/w/api.php?action=featuredfeed&feed=featured&feedformat=atom lists the following entries:
...