playlist not synced with iphone
I have a newly purchased album from iTunes which synced fine between my iMac, iPadPro and iPhone13Pro. However, when I put some tracks from it into a playlist on my iMac it synced fine with the iPad but is completely missing on the iPhone, though the rest of the playlist synced fine. I have shutdown both the iMac and iPhone to no avail. There have been no software updates since purchasing this album. All other playlist and album synchronisation still works fine - it's just this one specific album's contents that won't sync to a playlist. As a further test I created a specific playlist for just this album and tried to sync it to the iPhone but no tracks from it appear on the iPhone. The album is 'Some Devil' by Dave Matthews.
Any ideas as to what's going on will be gratefully received. Thanks.
iPhone 13 Pro