When I use a sheep controller in my woot farm, I just get all types of wool, but no mutton.

Since I got the same issue and @BluMasc did not reply , here is my un-touch loot.json for the sheep.

{
      "mob": "minecraft:sheep",
      "simulatedKills": [
        0,
        0,
        0,
        0
      ],
      "learnedDrops": []
    },

any fix by now? or do I need to edit the .json file to produce mutton?

Can you show me your woot/loot.json file?

I have some custom handling for the sheep to ensure that all colours are available. It doesn't seem to be working well with the learned sheep drops - ie. no mutton.