Parsing issue in Logging Subsystem - level is required by parser, but not schema

There seems to be an issue with the handler element parsing that expects the level and encoding to be defined, but they are both listed as minOccurs="0" in the schema.

Causes stack traces like the following:

10:31:32,371 ERROR [stderr] Exception in thread "Controller Boot Thread" java.lang.RuntimeException: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to parse configuration
10:31:32,371 ERROR [stderr] at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:89)
10:31:32,386 ERROR [stderr] at java.lang.Thread.run(Unknown Source)
10:31:32,386 ERROR [stderr] Caused by: org.jboss.as.controller.persistence.ConfigurationPersistenceException: Failed to parse configuration
10:31:32,386 ERROR [stderr] at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:115)
10:31:32,386 ERROR [stderr] at org.jboss.as.controller.AbstractControllerService.boot(AbstractControllerService.java:104)
10:31:32,386 ERROR [stderr] at org.jboss.as.server.ServerService.boot(ServerService.java:193)
10:31:32,386 ERROR [stderr] at org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:83)
10:31:32,402 ERROR [stderr] ... 1 more
10:31:32,402 ERROR [stderr] Caused by: java.lang.IllegalArgumentException: newValue is null
10:31:32,417 ERROR [stderr] at org.jboss.dmr.ModelNode.set(ModelNode.java:349)
10:31:32,417 ERROR [stderr] at org.jboss.as.logging.LoggingSubsystemParser.parseSizeRotatingHandlerElement(LoggingSubsystemParser.java:704)
10:31:32,417 ERROR [stderr] at org.jboss.as.logging.LoggingSubsystemParser.readElement(LoggingSubsystemParser.java:145)
10:31:32,417 ERROR [stderr] at org.jboss.as.logging.LoggingSubsystemParser.readElement(LoggingSubsystemParser.java:84)
10:31:32,417 ERROR [stderr] at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:100)
10:31:32,417 ERROR [stderr] at org.jboss.staxmapper.XMLExtendedStreamReaderImpl.handleAny(XMLExtendedStreamReaderImpl.java:69)
10:31:32,417 ERROR [stderr] at org.jboss.as.controller.parsing.StandaloneXml.parseServerProfile(StandaloneXml.java:311)
10:31:32,417 ERROR [stderr] at org.jboss.as.controller.parsing.StandaloneXml.readServerElement(StandaloneXml.java:163)
10:31:32,417 ERROR [stderr] at org.jboss.as.controller.parsing.StandaloneXml.readElement(StandaloneXml.java:91)
10:31:32,417 ERROR [stderr] at org.jboss.as.controller.parsing.StandaloneXml.readElement(StandaloneXml.java:79)
10:31:32,417 ERROR [stderr] at org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:100)
10:31:32,417 ERROR [stderr] at org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:59)
10:31:32,417 ERROR [stderr] at org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:107)
10:31:32,417 ERROR [stderr] ... 4 more