Jenkinsfile 2.150.x backward compatibility issue

Jenkinsfile

// With Jenkins 2.138.4
def extWorkspace

stage('Allocate Workspace') {
    extWorkspace = exwsAllocate 'diskpool1'  // Selected Disk ID 'd1' from the Disk Pool ID 'diskpool1'
                                             // The path on Disk is: test-exws/8
}
 
node() {                    // Running on Jenkins in /localdisk/martin/jenkins/jenkins/workspace/test-exws
    exws(extWorkspace) {    // Running in /localdisk/martin/diskpool1/test-exws/8
        sh 'pwd'            // /localdisk/martin/diskpool1/test-exws/8
        stage("Stage") {
            sh 'pwd'        // /localdisk/martin/diskpool1/test-exws/8 -> this path reverts to
                            // /localdisk/martin/jenkins/jenkins/workspace/test-exws in Jenkins 2.150.3
        }
        sh 'pwd'            // /localdisk/martin/diskpool1/test-exws/8
    }
}