Hi,

MC: 1.12.2
Forge: 2815
ExN: 0.3.8.3

I think, we can see (or can't see ^^) the problem. :)

So it appears that AE2 is injecting NBT data on the stack creation.

You'll need to edit your JSONs to get the fix, the defaults will be fixed in the next update.

Make each entry look like this.

    {
      "drop": {
        "name": "appliedenergistics2:crystal_seed",
        "meta": 0,
        "nbt": "{progress:0.0f}"
      },
      "chance": 0.01,
      "meshLevel": 1
    },

Okay, ty.

Ty