Playlist has no content on iPhone 6

[natakk]

I've a new iPhone6 with IOS 8.2 and when I sync my library all songs are synced correctly.
Also the playlists are synced and created on the iPhone. But most of them have no songs in the list.

If I add new songs to the playlist, some songs are synced to the phone and are displayed in the list.
Most of them are not shown in the list.

iTunes is up to date. Newest MM beta installed

Is there a solution out there?

[natakk]

I now decided to delete all music from my iphone trough itunes.
On a clean iphone i can sync without any problems and the playlists have content.

but! often the iphone oder MM is crashing now while it is sync music.
after an crash, MM didn't now all the music from the iphone.
per example: 1200 songs on iphone, 1200 songs on iphone see in itunes, in MM there
are only 750 songs on the iphone. sync starts again. tracks are not visible in playlists

i didn't have any problems with my iphone 5 IOS 8.1.2
problems started with changing to iphone 6 IOS 8.2

[Peke]

There is few sync tweeks in upcomming build 1739

[natakk]

deleted all data from iphone. next try to get a working sync over days and months.