With the config on, or with the config off, I can't get flint to drop from gravel. I've also tried setting it to drop other items.

This was with every version of pickle tweaks between june 2018 and today.

Sorry about terrible formatting, I'm a bad man. I've lived with it since then, because I love the mod, and I just made a CrT recipe to give me flint from 3 gravel. But I suppose you'd probably want to know eventually. monkaS