Hi,
I just try the new mesh SDK V2.0.0. And I found that there is an error if I compile the "examples\light_switch\proxy_client" more than one time.
The error is here:
The object file build/light_switch_proxy_client_nrf52840_xxAA_s140_6.0.0_Debug/obj/app_error.o has been supplied more than once
Could you try it?