System Information

• OS: [e.g. Windows]
• Blender version: [ 2.82]
• Add-on version: [ 6.2]

Make a cube, mark all edges as seams and uv unwrap it, in the uv editor resize uv islands randomly (make some big others small) , now select all faces and apply World Scale UV on manual mode (eg 1024 200 desity)
Expected behavior
each face (UV island) get similar size with the expected density

The behavior I got
the whole uv map get scaled strangely , if I want all faces to get similar size with the expected density I have to select them one by one and apply World Scale UV, which is inconvenient if I have a uv map with many uv islands