The git plugin currently offers several special rules on polling:

1. Polling ignores commits from certain users
2. Polling ignores commits from certain paths (Included/Excluded regions)
3. Polling ignores commits with certain messages
4. Branch specifier

For example:
checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'UserExclusion', excludedUsers: 'dvader'], [$class: 'PathRestriction', excludedRegions: 'One/.*', includedRegions: 'Test/.*'], [$class: 'MessageExclusion', excludedMessage: '.\\[maven-release-plugin
].']], gitTool: 'Default', submoduleCfg: [], userRemoteConfigs: [[credentialsId: '...', url: 'ssh://git@bitbucket.org/test.git']]])

If a commit is committed to bitbucket.org/test.git, regardless of the user, location, branch or message, the step that includes the checkout will be run.

Similar issue has been reported in:

• JENKINS-35988
• Configuration of includedRegions in Jenkinsfile?