Using the below pipeline script fails in the second stage and in any subsequent runs until the master or slave isn't restarted.

The error is:
ERROR: Cannot delete workspace...
 

The script:

stage('first') {
  node() {
    cleanWs()

    tee('output.log')

Unknown macro: {      echo 'test'    }

  }
}

stage('second') {
  node()

Unknown macro: {    cleanWs()     echo 'cleaned'  }

}

Marked as critical due to the fact that slave/master restart is required to resolve the issue and allow further runs to wipe the workspace (until tee is used again).