Playlist on iphone is missing

I have a number of playlists on Apple Music on my Mac. On both the Mac and the iPhone, I am logged in with the same Apple ID. Naturally, on the ipHone, i have "Sync Library" switched on in Settings/Music.

Problem is, on the iPhone, I can see most of my playlists, but NOT 2 (out of 46) playlists.

Unfortunately, those 2 playlists contain the bulk of my songs (around 10,000).

Those are also playlists where I don't get the option to "Publish on my profile and in search"; all other playlist show that check box.

I suspect it is one (or more) of the files in those playlists that prevent it from sync'ing.

But I can't find them. when I look at the cloud status, all songs in my library seem to show a good status (either "Apple Music", or "Uploaded", or "Matched").

I have also created a new playlist, and moved the files of the troublesome playlist into the new one, to no avail.

Of course, I have also googled a lot. The problem seems to be relatively wide-spread, but none of the proposed solutions worked for me.

Any ideas what I can do?

Best regards, Gabriel