Setting excludeTransitive in copy-dependencies might result in not copying direct dependencies

Under certain circumstances setting excludeTransitive to true in copy-dependencies goal might result in even direct dependencies to by excluded from copying.

The issue seems to be related to the fact that - depending on the setup of the maven project and history of builds -  snapshot dependencies might internally be represented by artifacts with version info containing timestamps. When checking whether a dependency is a direct dependency by using ProjectTransitivityFilter this might result in missing to correctly recognize such a dependency as a direct dependency and thus excluding it from copying.

https://github.com/ohecker/dependency-plugin-issue gives a setup and description to reproduce the issue.