JabRef version 3.8.1 on Mac OS X 10.12.2

Steps to reproduce:

1. Create bibliography with linked pdf in file field - absolute path
2. set all file directories (database properties and JabRef settings) to . to get attached files in same directory as the bib file
3. save the database
4. Cleanup Entries and enable Move linked files to default directory
5. attached files get copied into "JabRef.app/Contents/java/app

Have I forgotten something or is this a bug?

I can move them into the directory with the database, but this is not that nice.