The fix for #74 didn't actually fix it completely, the blacklist doesn't check for blocks in world, only for those in the inventory. So IC2 machines and cables are still eaten by the sigil, when near them. Also it seems that IC2 cables should be in this blacklist by default too.

Can be fixed by adding the same config check from ItemSigilLeech.getFood to ItemSigilLeech.eatGrowables

Also, even though I didn't check its behavior in game, the Ritual of the Natures Leech doesn't have this check too, so it quite probably will eat IC2 machines and cables as well.

Thanks for noticing this, will fix it ~Monday when I'm home from break :)

https://www.curseforge.com/minecraft/mc-mods/animus/files/2888473
Fix should be approved soon!
Make sure to add minecraft:grass to your leech blacklist, since it now detects IGrowables too.