FWIW: it looks like Uwe already created a new Jenkins JIRA for this, and
there is already a new PR to (try and) fix the new problem.
I created a github issue for my "jenkins-reports" side project (which is
what's consuming these RSS feeds and generating the reports) just so there
could be a single plass to track everything related to this (didn't make
sense to create a SOLR jira for this) ...