I thought Indian Reservations were under Federal Law ? Which is why they don’t have to charge State Sales tax on fuel.
So, IF they have a river running through the Warm Springs Indian Reservation they could hunt and fish on the Reservation.
I suspect the ban proposal will go down in flames, bigly. If it did pass, you might be able to hunt and fish in Indian reservations but you wouldn't be able to possess the fish or game outside of the Indian Reserve.