According to Photo contributor username is no longer displayed, user filter doesn't work. · Issue #181 · JOSM/Mapillary · GitHub and #21002 (Mapillary plugin: image date/time and author missing) – JOSM , image contributor username is not available in the new API - and thus unavailable to data consumers like JOSM.
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.
Could this please be brought back soon?