[MDEP-736] classifier applyed to other artifactItem

**[Julien CORON](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=juliencoron)** opened **[MDEP-736](https://issues.apache.org/jira/browse/MDEP-736?redirect=false)** and commented

When I use the plugin in the phase "package" and the goal "copy",  with the artifactItem having the classifier "agent", then the other instance of the plugin with the phase "prepare-package" and the goal "copy-dependencies" on the first artifactItem has the same classifier "agent".

Example:

\
\org.apache.maven.plugins\
\maven-dependency-plugin\
\3.2.1\
\
\
\unpack-jolokia\
\package\
\
\copy\
\
\
\
\
\
\
\org.jolokia\
\jolokia-jvm\
\1.6.0\
\jar\
\agent\
\${project.build.directory}/tmp\
\
\
\
\
\
\org.apache.maven.plugins\
\maven-dependency-plugin\
\3.0.0\
\
\
\copy-dependencies\
\prepare-package\
\
\copy-dependencies\
\
\
\${project.build.directory}/tmp\
\false\
\yyyyyyyy\
\
\
\
\unpack-help\
\prepare-package\
\
\unpack\
\
\
\
\
\aa.bbb.cccc\
\xxxxx\
\${xxxxxx.version}\
\jar\
\true\
\${project.build.directory}/classes/xxxxxxx\
\**/*\
\

--> This artifactItem will inherit the "classifier" = "agent" property, and should not.

---

**Affects:** 3.0.0

No source file or test is named. Reproduce the shown Maven configuration with the copy and copy-dependencies executions, then trace how artifactItem configuration is retained between plugin executions. Done means the second execution's artifactItem does not inherit the classifier "agent" from the first.

Written by the indexing model from the issue text.