When using the p4 plugin, on a job page, there is a duplicate blank menu item with a broken image for each time a checkout happens in a job.

For example, if there is a default checkout and a checkout scm step in the job, there will be two of these blank menu items. If using skipDefaultCheckout, and a checkout scm step, there will be one of these blank menu items.

To reproduce, I used the jenkins/jenkins:2.531 docker image of Jenkins with p4-plugin (1.17.2) as well as a clean docker instance of Perforce with a simple depot for tests. I created a simple job that pulls a Jenkinsfile from this stream, and in the pipeline it runs a checkout scm step. This results in these duplicate menu items.

I then recreated the jenkins instance, but using p4-plugin (1.17.1) and this behaviour does not exist: