Apple TV Gen 4 iphoto stream not rotating through full shared album

I've got an apple tv gen 4 set up to do screen saver photo stream using the photos from a shared iphoto album. The album has slightly over 2k+ photos. If I go into the shared album in the iphoto app on the apple tv and hit 'slideshow', the slideshow begins to randomly iterate through all the photos (which is what I want). However, if I select the same album from the 'settings'->'general'->'screen saver' panel and hit 'preview' (or allow the screen saver to start naturally) the screen saver only iterates through the same 20-30 pictures that are right at the beginning of the album. The screen saver used to randomly shuffle through the entire album (2k+ photos) but recently that stopped working.

I've tried logging in and out of my apple id, turning off and on the iphoto syncing, and turning off and on the apple tv.

Not sure what else to try. Would appreciate any guidance :]