No. I went back to Forsaken Airfield after the new DLC was installed and was able to get the radio and fix the transmitter without starting a new game. I've been finding caches all over the place! Some good loot in them too.
Once you collect them you use the crafting menu to prepare them, then crush them with the hammer then you can put a can on a stove, select "Cook" and the prepared acorn grounds should appear on the menu (along with coffee, herbal tea, rosehips etc.)
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