[truezip-maven-plugin] .tar.gz archives are missing files

[Treeston]

In indeterminate conditions, copying files into a .tar.gz archive causes that archive to not contain all included files.

I have produced a minimal working example, which can be run as mvn clean validate. This packages the input folder into two archives in the project root, output.zip and output.tar.gz. Both are produced using identical truezip-maven-plugin executions:

<execution>
    <id>test-tar-gz</id>
    <phase>validate</phase>
    <goals>
        <goal>copy</goal>
    </goals>
    <configuration>
        <fileset>
            <directory>${project.basedir}/input</directory>
            <outputDirectory>${project.basedir}/output.tar.gz/</outputDirectory>
        </fileset>
    </configuration>
</execution>

While the output.zip archive contains all the files as expected, output.tar.gz only includes what appears to be the last handful in alphabetical order:

I have verified this behavior in both Windows 10 running natively, as well as Ubuntu 20.04.3 LTS running in WSL.