Precondition: Buildscript results in single files and a directory with subdirectories

Steps:
1. add path to files and directories that in userContent that should be copied
2. specify /* or /**/
3. run job

Actual result: directories are omitted as "cp" is used

Expected result: directories are copied intact to target path

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Additional info:

Line used in copy field:

dir_1/dir_2/dir_3/*

Path relative to $JENKINS_HOME/userContent
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• dir_3 contains all the buildfiles including a dirctory with 2 levels of subdirectories.
• tryign also with dir_1/dir_2/dir_3/**/ e.g. and various other variations always ends up in: cp: omitting directory
• With just a quick glance at the code on github I couldn't find anything similar to <fileset dir="${src.dir}" includes="**"/>
• Is it currently even possible to also copy all directories in the specified path and keep their structures intact (I don't want anything flattened.)?