When you have an activated Sigil of Natures Leech in your inventory, Industrial Craft 2 Machines within its area of effect disappear/explode. They will also disappear from your inventory as though they were consumed.

wat... this is a joke right? it only looks for blocks that extend IPlantable, which definitely would not include ic2 machines. Can you give us some specifics, forge version/ic2 version etc so we can try and reproduce

As dumb as it sounds, no, it is not a joke. I tested it by turning on and off the sigil, and it only happened while active. Playing in the most up to date version of Enigmatica 2 Expert.
Forge Version - 14.23.5.2781
Industrialcraft - 2-2.8.120
Animus - 2.1.2

That's uhh... yup. Looking into it.

So this is a thing

The fix didn't fix the consumption of IC2 machines and cables from the world, as it only checks the blacklist for the items in the inventory, it seems.