Shared album won't sync fully with MacBook Pro
Yesterday, I created two shared albums in Photos from my iPhone 7 (iOS 13.3.1). One album has 13 photos; the second album has 16. The first album synced with Photos on my MacBook Pro with no problem. The second album displays only two of the 16 photos.
The shared album displays all 16 photos on the iPhone and on my iPad. People who've subscribed to the shared album have all 16 photos, but my own MacBook Pro has just two.
Why?
I've tried restarting the MacBook; I've restarted my iPhone. I've signed out of my iCloud account and signed back in. I hope someone here can point me to a solution.
MacBook Pro 13", macOS 10.15