Also tested this with:
var processDefinitionId = execution.getProcessDefinitionId();
var deploymentId = execution.getProcessEngineServices().getRepositoryService().getProcessDefinition(processDefinitionId).getDeploymentId();
var resource = execution.getProcessEngineServices().getRepositoryService().getResourceAsStream(deploymentId, 'content.txt');
var commonsIo = new JavaImporter(org.apache.commons.io.IOUtils);
with (commonsIo) {
var String = Java.type("java.lang.String");
var content = new String(IOUtils.toByteArray(resource), 'UTF-8');
};
and same issue