Dear Friend, I am in PNW as well, I have same problem, My potted small fig trees are eaten down to base, very sad, It is very hard to get cuttings in Canada, It is Squirrel that I saw them at night, They can not find food now and very hungry, I end up feeding them some peanuts, Avocado pits etc, I am trying to get mouse trap to catch them.
I think that fig trees, At the winter time, it converts its sap to skin as anti-freeze, When temperature is warmer, it converts them back to tree in form of sugar and soften their branches ready to wake up from dormancy, Potted fig trees wake up earlier and Rats/squirrels can not find other food, They become target of eaten. In ground fig trees wake up later than many trees and their branches are harder, it is less problem of eaten by squirrels.