Report link on new forms - create new record

On the new forms, the report link has a new feature where you can create a new child, with a sort of - embedded button. 

Does anyone know how QB sets the code for this button? It seems like it only works some of the time for me. Perhaps it doesn't work correctly cross app? I am still trying to determine it, but wondering if anyone has insight or experience. Would be awesome if we could set the coding in that embedded button, in case we need to modify.