Cannot retrigger events: "No jobs triggered for this event"

Hello,
we are running Jenkins 2.277.2 and have the issue that Gerrit triggers does not work anymore.
We can see the Gerrit event in question in the “Gerrit Manual Trigger” (/gerrit_manual_trigger/), select it and click on “Trigger Selected”, but then it would just display the Gerrit review number in the top left corner and state: No jobs triggered for this event
We have restarted the Jenkins service and the Jenkins server, but this doesn’t improve things.
Does anyone have already come across this issue ?
Thanks
Rainer