dimyself
my (diagnostics)app only has the "sensors" (which is normal)
and the "network" permission
(these are the default settings, is what i mean)
(it says when you want to use the device diagnostic that network is needed)
i never used the diagnistic feature, maybe you did and then it asks for these permissions?
anyway you probably can just disable all of them.
but considering it is a system app, there is really no need for this, and who knows what suddenly depends on this app..