After upgrading Microfocus Automation Plugin from 7.3 to 7.4, editing and saving of Pipeline and Multibranch Pipelines no longer displays the Pipeline script field.

When saving the configuration from the UI for pipeline job, the following message appears in jenkins error log:

WARNING hudson.model.Descriptor#verifyNewInstance: Father of org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition@7be8c613 and its getDescriptor() points to two different instances. Probably misplaced @Extension. See http://hudson.361315.n4.nabble.com/Help-Hint-needed-Post-build-action-doesn-t-stay-activated-td2308833.html

Pipeline plugin ver: 590.v6a_d052e5a_a_b_5

Jenkins version: 2.332.4

Reverting plugin back to 7.3 resolves the issue.