maven-dependency-plugin:unpack ignores type configuration

There are two independent Maven projects. There isn't neither common parent nor aggregator POM files.

The second project needs some classes provided by shared-tests. More precisely I'd re-use some common test cases in dependent project and run them during test and integration-test phases.

The first project (shared-tests) contains some shared test cases.

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>io.github.zforgo.stackoverflow</groupId>
    <artifactId>shared-tests</artifactId>
    <version>0.1.0-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
        <maven.compiler.release>11</maven.compiler.release>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>5.7.0</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.2.0</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>test-jar</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
</project>

After running

mvn clean install

the test jar has stored alongside production jar.

spinner@zaphod:~/.m2/repository/io/github/zforgo/stackoverflow/shared-tests/0.1.0-SNAPSHOT$ ll
total 28
drwxrwxr-x 2 spinner spinner 4096 Dec 20 15:16 ./
drwxrwxr-x 3 spinner spinner 4096 Dec 20 15:16 ../
-rw-rw-r-- 1 spinner spinner  931 Dec 20 15:23 maven-metadata-local.xml
-rw-rw-r-- 1 spinner spinner  248 Dec 20 15:23 _remote.repositories
-rw-rw-r-- 1 spinner spinner 3183 Dec 20 15:23 shared-tests-0.1.0-SNAPSHOT.jar
-rw-rw-r-- 1 spinner spinner 3299 Dec 20 14:41 shared-tests-0.1.0-SNAPSHOT.pom
-rw-rw-r-- 1 spinner spinner 3961 Dec 20 15:23 shared-tests-0.1.0-SNAPSHOT-tests.jar

The second project defines the shared-tests as a test-scoped dependency and during generate-test-sources phase it tries to unpack.

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>io.github.zforgo.stackoverflow</groupId>
    <artifactId>project</artifactId>
    <version>0.1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>io.github.zforgo.stackoverflow</groupId>
            <artifactId>shared-tests</artifactId>
            <version>0.1.0-SNAPSHOT</version>
            <type>test-jar</type>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>3.1.2</version>
                <executions>
                    <execution>
                        <id>share-tests</id>
                        <phase>generate-test-sources</phase>
                        <goals>
                            <goal>unpack</goal>
                        </goals>
                        <configuration>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>io.github.zforgo.stackoverflow</groupId>
                                    <artifactId>shared-tests</artifactId>
                                    <version>0.1.0-SNAPSHOT</version>
                                    <type>test-jar</type>
                                    <outputDirectory>${project.build.directory}/alternateLocation</outputDirectory>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

But when I run

mvn install

the production artifact of shared-tests will be unpacked instead of test-jar.

[INFO] ---------------< io.github.zforgo.stackoverflow:project >---------------
[INFO] Building project 0.1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:3.1.2:unpack (share-tests) @ project ---
[INFO] Configured Artifact: io.github.zforgo.stackoverflow:shared-tests:0.1.0-SNAPSHOT:test-jar
[INFO] Unpacking /home/spinner/.m2/repository/io/github/zforgo/stackoverflow/shared-tests/0.1.0-SNAPSHOT/shared-tests-0.1.0-SNAPSHOT.jar to /work/source/stackoverflow/junit-test-sharing/test-jar/project/target/alternateLocation with includes "" and excludes ""
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------

Based on the logs the desired artifact has been configured

Configured Artifact: io.github.zforgo.stackoverflow:shared-tests:0.1.0-SNAPSHOT:test-jar

but the wrong one was unpacked.

Unpacking [...]/shared-tests/0.1.0-SNAPSHOT/shared-tests-0.1.0-SNAPSHOT.jar to ...

Is this a bug or is there any possibility to unpack test-jar into an other project? Probably using <classifier/> can be a solution but that is not made to specify type of an artifact.