After downloading the 13.2 update, I noticed that Autumn's 'Event' photos were inaccessible (file icon had reverted to 'locked') in the PC.
I loaded the same save in 13.1 again and found that the folder was still accessible.
This is a save on day 295 with practically everything doable already done. I assume there was some kind of change to that event in the update which might have messed up the flag?