If playlists are created or edited on [Devices] of the tree view, these changes are only reflected on the playlists in the library for which the controls had been performed.

The following control methods are recommended for device playlist editing.

First, edit the playlist on [Playlists] of [Collection].
You can reflect the playlist edits to both libraries by exporting to the device afterward.

To synchronize Device Library Plus and Device Library playlists from the state in which they are different, see the "Device Library Plus User’s Guide" for more details.