How can I ignore Log4j2 Kafka appender warning messages when broker is not available?

I have a java appllication which uses log4j2 to log to the console. I wish to send specific log messages from my java application to a kafka server in an aynchronous manner, while still sending other logs to the console. However, when the Kafka server is unavailable, console is being flooded with "Broker may not be available" warning messages, and other logs suposed to go to console seem to wait in queue until the client timeout.

I am using the VM options as instructed in log4j2 documentation for asynchonous logging

-Dlog4j2.contextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector

I have tried setting syncSend to false on the Kafka appender, wraping it with AsyncAppender but nothing seems to work.

This is an example to reproduce the problem

package main;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.MarkerManager;

public class Main {

    public static void main(String[] args) {

        Logger logger = LogManager.getLogger();
        Marker kafkaMarker = MarkerManager.getMarker("KAFKA");

        logger.info("someErrorMessage");

        logger.info(kafkaMarker, "someKafkaMessage");

        for (int i = 0; i < 100; i++) {
            logger.info("someErrorMessage: " + i);
        }
    }
}

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>org.example</groupId>
    <artifactId>untitled</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <log4j2.version>2.13.3</log4j2.version>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>${log4j2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>${log4j2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-slf4j-impl</artifactId>
            <version>${log4j2.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-log4j-appender</artifactId>
            <version>2.0.1</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>com.lmax</groupId>
            <artifactId>disruptor</artifactId>
            <version>3.4.2</version>
        </dependency>
    </dependencies>

</project>

log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="INFO" strict="true">
    <Properties>
        <Property name="LOG_PATTERN">
            %c.%M %m %ex%n
        </Property>
    </Properties>
    <Appenders>
        <Console name="ConsoleAppender" target="SYSTEM_OUT">
            <Layout type="PatternLayout" pattern="${LOG_PATTERN}"/>
        </Console>
        <Kafka name="KafkaAppender" topic="logProducer" syncSend="false">
            <Property name="bootstrap.servers">localhost:9092</Property>
            <MarkerFilter marker="KAFKA" onMatch="ACCEPT" onMismatch="DENY"/>
            <Layout type="PatternLayout" pattern="${LOG_PATTERN}"/>
        </Kafka>
        <Async name="AsyncKafkaAppender">
            <AppenderRef ref="KafkaAppender"/>
        </Async>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="KafkaAppender" />
            <AppenderRef ref="ConsoleAppender" />
        </Root>
    </Loggers>
</Configuration>