Apparently, this new update has also caused problems for OSM integration authors.
JOSM plugin author mentioned that image contributor info is not available anymore.
This is extremely limiting in some scenarios, where I would like to filter for, or filter out images by some user (myself or somebody else). In other cases, knowing the contributor allows to know what to expect quality/coverage wise.
I also started a separate thread on this at Page not found with links to JOSM tickets.