When you click on the become checkfield in the job configuration on the Invoke Ansible Playbook Element, the checkbox does not stay checked after saving and re-editing the configuration or building the project. Thus, you have to manually click the checkbox again after each change in the configuration or after each build. This also applies for the job's configration file ({Jenkins_Home}/workspace/jobs/config.xml), where the become tag gets overwritten to "False" after each save or build.