Drag&Drop out of OO5



I am a pretty new user to OmniOutliner5, so I am unsure whether it is a bug or a feature:
I can drag&drop files to OmniOutliner and they are embedded - if works fine.
However, when I try to drag&drop the same files out of OO5, either an empty file named “•—.textClipping” is produced, or OO5 crashes completely. I’ve send a crash report, but it seems to be a pretty obvious workflow. Am I doing something wrong, or something I am not intended to do?