CMDBTransformUtil in Transf. Map onBefore script incorrectly switching CI class from child to parent

[AntonioG4352175]

We are using the CMDBTransformUtil() API within an onBefore transform map script to process records through the CMDB Identification and Reconciliation Engine (IRE). The transform map is targeted to the cmdb_ci_server table.

When running the transform, existing CIs that belong to a child class, Linux servers on table cmdb_ci_linux_server, are being incorrectly upgraded/changed to the parent class cmdb_ci_server instead of remaining on their original subclass. The reconciliation rule is configured for cmdb_ci_server, but the class should not be downgraded or upgraded automatically.

Existing CIs should retain their current class (cmdb_ci_linux_server), IRE should update attributes without switching the CI to a parent class.

Matched CIs are being moved from cmdb_ci_linux_server to cmdb_ci_server after cmdbUtil.identifyAndReconcile() executes.

Is there a property or setting within CMDBTransformUtil / IRE to prevent class switching?
What is the recommended approach to keep the existing CI class while still using the IRE via CMDBTransformUtil?

Script:

var cmdbUtil = new CMDBTransformUtil();

    cmdbUtil.setDataSource('ImportSet');

    cmdbUtil.identifyAndReconcileEnhanced(source, map, log);

    ignore = true;

    if (cmdbUtil.hasError()) {

        var errorMessage = cmdbUtil.getError();

        log.error(errorMessage);

    } else {

        log.info('IE Output Payload: ' + cmdbUtil.getOutputPayload());

        log.info('Imported CI: ' + cmdbUtil.getOutputRecordSysId());

    }