MESH callback is not properly called when multiple models registered in an element

When designing MESH device, it is possible for an element to contain multiple models inside.

For example, we can register a generic level server and a level client into an element, and it is so-called "control model".

But, in current SDK 1.6.1, only one model can call its callback, in my case, MS_ACCESS_GENERIC_LEVEL_STATUS_OPCODE is received in level server, but not in level client.

Is this behaviour by design, or bug?

Should I modify "generic_level_opcode_list" in "app_model_level.c" and separate to "generic_level_server_opcode_list/generic_level_client_opcode_list"?