When maps have poor or missing thumbnails they can be overridden with a standalone image. This functionality no longer works - either the missing-texture texture shows up, or the missing-preview image shows up. The console will show Couldn't load maps/<map_name> using "%s.tga", "%s.png", "%s.jpg", "%s.pcx" or "%s.lmp".. Scruffy did some bisection and confirmed it appears to break in https://github.com/DarkPlacesEngine/darkplaces/commit/0766a43538f3b526cba347157d5259bb3e5785a9.
When maps have poor or missing thumbnails they can be overridden with a standalone image. This functionality no longer works - either the missing-texture texture shows up, or the missing-preview image shows up. The console will show
Couldn't load maps/<map_name> using "%s.tga", "%s.png", "%s.jpg", "%s.pcx" or "%s.lmp".
. Scruffy did some bisection and confirmed it appears to break in https://github.com/DarkPlacesEngine/darkplaces/commit/0766a43538f3b526cba347157d5259bb3e5785a9.