When there are 2 or more global libraries P4Jenkins will use the same SyncID for both. This causes polling to always find a change even when no change has occurred.

P4: Polling on: master with:jenkins-library
Found last change 3 on syncID jenkins-library
Found last change 2 on syncID jenkins-library
  ...cut...
P4: Polling with range: 2,3
... p4 changes -m20 //jenkins-library/...@2,3 +
 ...cut...
Changes found

Reproduction Steps:

(1) Under Manage Jenkins add two Helix based Libraries called 'my-shared-library' (org.foo.lib) and 'my-shared-library2' (org.bar.lib).

(2) Create a Jenkinsfile that includes both libraries and uses one of them. For example:

@Library('my-shared-library')
@Library('my-shared-library2')
import org.foo.lib.*
import org.bar.lib.*
pipeline {
  agent { label 'master' }
  stages {
    stage("Repro") {
      steps {
        script {
           def z = new org.foo.lib()
           z.testFunc1()
           z.testFunc2()
        }
      }
    }
  }
}

(3) Create a pipeline job that uses the above Jenkinsfile and uses polling as the build trigger.

(4) Manually run the build.

(5) Wait for each poll interval.

Result: A build is triggered for every poll.

Expected Result: Only a change submitted to the libraries after step (4) should cause a poll to trigger a build.