The RHV GUI fails to load with "Duplicate key VM" message

Issue

After successfull VM import from the Export domain and ovirt-engine service restart RHV GUI fails to load with following messages in engine.log

ERROR [org.ovirt.engine.core.bll.network.macpool.MacPoolPerCluster] (ServerService Thread Pool -- 62) [] Error initializing: Duplicate key VM [test]
ERROR [org.ovirt.engine.core.bll.Backend] (ServerService Thread Pool -- 62) [] Error during initialization: javax.ejb.EJBException: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
Caused by: java.lang.IllegalStateException: WFLYEE0042: Failed to construct component instance
        at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
        at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:134)
        at org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:88)
Caused by: javax.ejb.EJBException: java.lang.IllegalStateException: Duplicate key VM [test]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:188) [wildfly-ejb3-7.1.3.GA-redhat-2.jar:7.1.3.GA-redhat-2]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:277) [wildfly-ejb3-7.1.3.GA-redhat-2.jar:7.1.3.GA-redhat-2]
        at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:349) [wildfly-ejb3-7.1.3.GA-redhat-2.jar:7.1.3.GA-redhat-2]