Calling ontrack from Jenkins using OntrackDSLStep

Using below snippet we are not able to generate Use the provided DSL script in Jenkins

How can i make usingText to true by using ontrackDSLStep?
Plugin version: ontrack@3.4.1

But if i use below configuration, I am able to see the content as per expected.
configure { node ->
node / builders / 'net.nemerosa.ontrack.jenkins.OntrackDSLStep' {
usingText true
injectEnvironment 'BRANCH'
injectProperties ''
ontrackLog true
sandbox false
ignoreFailure false
scriptText '''println "BRANCH = ${BRANCH}"

def myBranch = "${BRANCH}"
if (myBranch.startsWith('branches/')) {
myBranch = myBranch - 'branches/'
}
myBranch = myBranch.replaceAll('/', '-')

def ontrackBranch = myBranch
if (ontrackBranch.endsWith('x')) {
ontrackBranch = ontrackBranch - 'x'
}

Start at the OntrackDSLStep entry point and compare the shown Jenkins configuration with the plugin's DSL handling for usingText. Reproduce the issue with ontrack@3.4.1 using the provided snippet, then verify that the step can generate and execute the supplied DSL script with usingText enabled.

Written by the indexing model from the issue text.