Bug when using child markers and filtering for parent

loggingMarkerBug_loggingMarker (1).iml

<?xml version="1.0" encoding="UTF-8"?>
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6">
    <output url="file://$MODULE_DIR$/target/classes" />
    <output-test url="file://$MODULE_DIR$/target/test-classes" />
    <content url="file://$MODULE_DIR$">
      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
      <excludeFolder url="file://$MODULE_DIR$/target" />
    </content>
    <orderEntry type="inheritedJdk" />
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="Maven: org.codehaus.janino:janino:3.0.8" level="project" />
    <orderEntry type="library" name="Maven: org.codehaus.janino:commons-compiler:3.0.8" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.testng:testng:6.8" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.10" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.1" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.beanshell:bsh:2.0b4" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: com.beust:jcommander:1.27" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.yaml:snakeyaml:1.6" level="project" />
    <orderEntry type="library" name="Maven: log4j:log4j:1.2.17" level="project" />
    <orderEntry type="library" name="Maven: org.slf4j:slf4j-api:1.7.13" level="project" />
    <orderEntry type="library" name="Maven: ch.qos.logback:logback-classic:1.2.3" level="project" />
    <orderEntry type="library" name="Maven: ch.qos.logback:logback-core:1.2.3" level="project" />
  </component>
</module>

loggingMarkerBug_loggingMarker.iml

<?xml version="1.0" encoding="UTF-8"?>
<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6">
    <output url="file://$MODULE_DIR$/target/classes" />
    <output-test url="file://$MODULE_DIR$/target/test-classes" />
    <content url="file://$MODULE_DIR$">
      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
      <excludeFolder url="file://$MODULE_DIR$/target" />
    </content>
    <orderEntry type="inheritedJdk" />
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="Maven: org.codehaus.janino:janino:3.0.8" level="project" />
    <orderEntry type="library" name="Maven: org.codehaus.janino:commons-compiler:3.0.8" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.testng:testng:6.8" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.10" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.1" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.beanshell:bsh:2.0b4" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: com.beust:jcommander:1.27" level="project" />
    <orderEntry type="library" scope="TEST" name="Maven: org.yaml:snakeyaml:1.6" level="project" />
    <orderEntry type="library" name="Maven: log4j:log4j:1.2.17" level="project" />
    <orderEntry type="library" name="Maven: org.slf4j:slf4j-api:1.7.13" level="project" />
    <orderEntry type="library" name="Maven: ch.qos.logback:logback-classic:1.2.3" level="project" />
    <orderEntry type="library" name="Maven: ch.qos.logback:logback-core:1.2.3" level="project" />
  </component>
</module>

loggingMarkerBug_pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.chiefer.hacking</groupId>
    <artifactId>loggingMarker</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <properties>
        <java.version>1.8</java.version>
        <logback.version>1.2.3</logback.version>
        <slf4j.version>1.7.25</slf4j.version>
        <testng.version>6.8</testng.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.codehaus.janino</groupId>
            <artifactId>janino</artifactId>
            <version>3.0.8</version>
        </dependency>

        <dependency>
            <groupId>org.testng</groupId>
            <artifactId>testng</artifactId>
            <version>${testng.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.13</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>${logback.version}</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>${logback.version}</version>
        </dependency>


    </dependencies>
</project>

loggingMarkerBug_src_main_java_com_keithreynolds_BugWithChildMarker.java

package com.keithreynolds;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;

public class BugWithChildMarker {

    private static Logger logger = LoggerFactory.getLogger(BugWithChildMarker.class);

    public static void main(String[] args) {

        // setup such that foobar should always come out in STDOUT
        Marker parent = MarkerFactory.getMarker("foobar");
        Marker child = MarkerFactory.getMarker("sub");
        // due to nesting this should also come out in STDOUT
        parent.add(child);

        Marker bazMarker = MarkerFactory.getMarker("baz");

        // per config - no marker defined so no output in stdout
        logger.debug("Debug log message");
        logger.info("Info log message");
        logger.error("Error log message");

        // both of these should go out to stdout
        logger.debug(parent, "PARENT foobar marker here");
        logger.debug(child, "CHILD marker here"); //<< does not output to stdout

        // this will be filter out of stdout
        logger.debug(bazMarker, "OTHER baz marker");
    }
}

loggingMarkerBug_src_main_resources_logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
            </Pattern>
        </layout>
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator class="ch.qos.logback.classic.boolex.OnMarkerEvaluator">
                <marker>foobar</marker>
                <!--<marker>sub</marker>-->
            </evaluator>
            <onMismatch>DENY</onMismatch>
        </filter>
    </appender>

    <root level="debug">
        <appender-ref ref="STDOUT"/>
    </root>

</configuration>