I can store food in a coffin or locker, even after adding it to the short name list.

Please provide your config file

{
  "Food List": [
    "apple",
    "apple.spoiled",
    "black.raspberries",
    "blueberries",
    "cactusflesh",
    "can.beans",
    "can.tuna",
    "chocholate",
    "fish.cooked",
    "fish.raw",
    "fish.minnows",
    "fish.troutsmall",
    "granolabar",
    "chicken.burned",
    "chicken.cooked",
    "chicken.raw",
    "chicken.spoiled",
    "deermeat.burned",
    "deermeat.cooked",
    "deermeat.raw",
    "horsemeat.burned",
    "horsemeat.cooked",
    "horsemeat.raw",
    "humanmeat.burned",
    "humanmeat.cooked",
    "humanmeat.raw",
    "humanmeat.spoiled",
    "bearmeat.burned",
    "bearmeat.cooked",
    "bearmeat",
    "wolfmeat.burned",
    "wolfmeat.cooked",
    "wolfmeat.raw",
    "wolfmeat.spoiled",
    "meat.pork.burned",
    "meat.pork.cooked",
    "meat.boar",
    "mushroom",
    "jar.pickle",
    "candycane",
    "corn",
    "clone.corn",
    "clone.hemp",
    "pumpkin",
    "clone.pumpkin",
    "smallwaterbottle",
    "waterjug",
    "seed.corn",
    "seed.hemp",
    "seed.pumpkin",
    "potato",
    "clone.potato",
    "seed.potato"
  ],
  "Unallowed container": [
    "repairbench",
    "woodbox",
    "box.wooden.large",
    "coffin.storage",
    "small.stash",
    "locker",
    "furnace.large",
    "furnace",
    "dropbox",
    "small.oil.refinery"
  ]
}

Hello,
The last update include coffin and locker.
Let me know if it has still a problem on your side