JabRef 5.0-dev--snapshot--2019-01-05--master--d281ece4b
Linux 4.15.0-43-generic amd64
Java 1.8.0_191

The

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behaviour reported on 9 December is back. :-(

As before, selecting the preview and copying it with ctrl+C does put an un-tagged copy into the buffer correctly. But ctrl+shft+C isn't working properly, either from the mouse right-click, the dropdown edit menu or by key presses.