Albums from Photos on my MacBook not syncing to iPhone (not using iCloud)

I have a MacBook Pro with Sonoma 14.2.1 and a new iPhone 15Pro.

I have many albums on my MacBook in the Photos application. When connecting my iPhone, it shows up, in the sync menu I indicate to copy all albums from the Photos library but these are not syncing (or only what seems a random few).

I have already repaired the Photos library - did not help.

Any suggestions (and no I don't want to use iCloud for this)?

PS: Plenty of space on my iPhone.

PPS: The same happens with the Peoples

PPPS: Using sync all photos and albums or selecting a few does not change things.