In a MultiBranch Pipeline, when adding properties to Jenkinsfile like follow, configuration became permanent even if removed from Jenkinsfile

properties([[$class: 'BuildDiscarderProperty',
  strategy: [$class: 'LogRotator', numToKeepStr: '10']],
  pipelineTriggers([cron('H/30 9-23 * * *')]),
])

Deleting and recreating the job seems the only way to reset properties.