• I have a Jenkins node master "master" (on Windows) + 1 agent called "Alpha" (on Windows)
• I have an Github Enterprise Repository configured in Jenkins.

• I use a JenkinsFile for the pipeline with this :

pipeline {
	options {
		skipDefaultCheckout(true)
		disableConcurrentBuilds()
	}
	agent {
		label 'Alpha'
	}
        ....
}

All works well when:

• I start a build manually in Jenkins -> the build is executed with the "Alpha" agent
• I commit on Git => Trigger a build on the "Alpha" agent

But when I create a pull request, the build is executed on the "master" agent