Release notes:

This is an unscheduled patch release to correct minor issues appearing after the v4.0.18 release.

Status: Released
Release date: 2 November 2022

Bug 897 – Photo library default category error
If a “Photo category” already assigned to an image is subsequently unpublished, the image should no longer be visible in the frontend. The image and the category was correctly hiding itself but causing an error in the library.
—[FIXED]