CsvParameterLayout and CsvLogEventLayout insert NUL character if data starts with {, (, [ or "

I am using CsvParameterLayout to generate a CSV file out of log4j2. One of the column is a JSON string. Following is the logger method I am using:

logger.info("log:{}",json);

Following is the JSON string:

And following is the string which is getting printed in CSV output file:

NUL

NUL

The NUL character is the \x00 character. When I open the file in notepad++, then only this character appears. In notepad it shows as space. This poses a problem in CSV processing module.

If there is some alphabet before {, then the output in CSV is fine. It seems as if log4j is escaping '{' with a NUL character. It is happening if the string starts with

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.4</version>
</dependency>