Transport Slicing integration: unable to get prefix environment variable from execution in TnNssmfUntils

2020-10-14T17:54:53.177Z||org.camunda.bpm.engine.context - ENGINE-16004 Exception while closing command context: Unable to evaluate script while executing activity 'Activity_16luyg1' in the process definition with id 'DoCreateTnNssiInstance:7:b2187e1a-0e3f-11eb-a6e5-0242ac120019': groovy.lang.MissingMethodException: No signature of method: org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.setVariable() is applicable for argument types: (String) values: [prefix]
Possible solutions: getVariable(java.lang.String), setVariable(java.lang.String, java.lang.Object), getVariable(java.lang.String, boolean), setVariables(java.util.Map), setVariable(java.lang.String, java.lang.Object, java.lang.String), getVariables()
org.camunda.bpm.engine.ScriptEvaluationException: Unable to evaluate script while executing activity 'Activity_16luyg1' in the process definition with id 'DoCreateTnNssiInstance:7:b2187e1a-0e3f-11eb-a6e5-0242ac120019': groovy.lang.MissingMethodException: No signature of method: org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.setVariable() is applicable for argument types: (String) values: [prefix]