Missing animated build icon in view when build is waiting for next free node after Jenkins update

After we updated Jenkins to 2.319.3 LTS i can’t see if a build is waiting or is not planned / waiting. Maybe we disabled a plug-in which animated the build icon in the view, or there is a setting which was switch off during the update.

The user interface now is a hollow green play icon, before the update that was the standard solid clock build icon with a small solid green play icon.

So now i have to open the job to see if the build is just waiting or if something else is preventing the job to start. I searched for a plug-in who is maybe responsible for that, but didn’t find something which list that in its description. Maybe this is a newbie question, sorry for that.