Anyone is able to tweak the priorities, not only admins.
Just noticed that you made this a feature request.
I marked it as a bug because I honestly assumed that no one but admins should mess with this, and something was failing.
Anyway, thanks for looking into this. I hope I can enable it again soon.
Actually it done like this and the thinking was that in the previous version anyone could adjust the priority on the Jobs so let's do it like this ...
That being said, I have considered adding permissions to the priority configuration and now I have a +1 to add it.
Code changed in jenkins
JENKINS-21173 Anonymous Users Can Configure Priorities
Optionally only Administrators are now allowed
to edit Job Priorities
Fixed in 2.4
When will this be available as a plugin update?