Functionality "Initialization from existing diagram" does not work

The function “Initialization from existing diagram” available in the palette does not work properly.

The aim of this functionality is to generate easily a view with realizing elements from the previous layer, but some (a lot of) realizing elements are missing on the diagram after using this function.

See picture below as example.

Anybody has any idea why this is happening? This behaviour was witnessed on Capella 1.4.2 and 5.2.