A 'java.lang.NullPointerException' error is returned when creating a KeycloakRealm using authenticationFlows with the Red Hat Single Sign-On (RH SSO) Operator

Issue

A java.lang.NullPointerException error is returned when the RH SSO Operator tries to reconcile our KeyCloakRealm CR with authenticationFlows:

20:55:33,598 ERROR [org.keycloak.services.error.KeycloakErrorHandler] (default task-1) Uncaught server error: java.lang.NullPointerException
    at org.keycloak.keycloak-server-spi-private@18.0.8.redhat-00001//org.keycloak.models.utils.KeycloakModelUtils.deepFindAuthenticationExecutions(KeycloakModelUtils.java:482)
    at org.keycloak.keycloak-server-spi-private@18.0.8.redhat-00001//org.keycloak.models.utils.DefaultAuthenticationFlows.firstBrokerLoginFlow(DefaultAuthenticationFlows.java:605)
    at org.keycloak.keycloak-server-spi-private@18.0.8.redhat-00001//org.keycloak.models.utils.RepresentationToModel.importAuthenticationFlows(RepresentationToModel.java:812)

  ...

    at org.jboss.threads@2.4.0.Final-redhat-00001//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
    at org.jboss.xnio@3.8.9.Final-redhat-00001//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282)
    at java.base/java.lang.Thread.run(Thread.java:829)