The Red Hat Single Sign-On (RH SSO) container crashes when using 'ENABLE_JSON_LOGGING=true'

Issue

When attempting to set ENABLE_JSON_LOGGING=true, the RH SSO container images crashes with the following error:

{"@timestamp":"TIMESTAMP","sequence":11,"loggerClassName":"org.jboss.as.server.logging.ServerLogger_$logger","loggerName":"org.jboss.as.server","level":"ERROR","message":"WFLYSRV0055: Caught exception during boot","threadName":"Controller Boot Thread","threadId":29,"mdc":{},"ndc":"","hostName":"HOSTNAME","processName":"jboss-modules.jar","processId":807,"stackTrace":": org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration\n\tat org.jboss.as.controller@15.0.15.Final-redhat-00001//org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:143)\n\tat org.jboss.as.server@15.0.15.Final-redhat-00001//org.jboss.as.server.ServerService.boot(ServerService.java:408)\n\tat org.jboss.as.controller@15.0.15.Final-redhat-00001//org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:447)\n\tat java.base/java.lang.Thread.run(Thread.java:829)\n","@version":"1","log-handler":"CONSOLE"}
{"@timestamp":"TIMESTAMP","sequence":12,"loggerClassName":"org.jboss.logging.DelegatingBasicLogger","loggerName":"org.jboss.as.server","level":"FATAL","message":"WFLYSRV0056: Server boot has failed in an unrecoverable manner; exiting. See previous messages for details.","threadName":"Controller Boot Thread","threadId":29,"mdc":{},"ndc":"","hostName":"HOSTNAME","processName":"jboss-modules.jar","processId":807,"@version":"1","log-handler":"CONSOLE"}
{"@timestamp":"TIMESTAMP","sequence":13,"loggerClassName":"org.jboss.as.server.logging.ServerLogger_$logger","loggerName":"org.jboss.as","level":"INFO","message":"WFLYSRV0050: WildFly Core 15.0.15.Final-redhat-00001 stopped in 6ms","threadName":"MSC service thread 1-1","threadId":18,"mdc":{},"ndc":"","hostName":"HOSTNAME","processName":"jboss-modules.jar","processId":807,"@version":"1","log-handler":"CONSOLE"}