No cobblestone drops except with regular pickaxes

[matthenry]

Hi everyone!

I'm playing a modified Direwolf20 modpack (removed/added some mods) and I just started a new world with RTG as world generator.
I'm using a custom geographycraft.cfg for Defiled Lands biomes to be generated, which I got from the RTG Discord.

I know that support for customized or non-FTB modpacks is limited or won't even be possible, but I wanted to give it a shot and maybe someone dares to look into this or even knows of this issue:

I am not able to mine cobblestone from stone with any modded tool: tinker's pickaxes or hammers, fluxbore, monk mod's stone hands. I can also not harvest other vanilla stones like diorite, granite or andesite. Except I'm using a more or less regular pickaxe: dia pickaxe, iron pickaxe, even osmium pickaxes work. (Added all Mekanism mods).
The blocks aren't teleported to my inventory or dank/null though, they just don't drop.

So, hopefully someone wants to take on this problem, which annoys me somewhat.

Thanks for reading!

PS: I'll work out a list of added and removed mods, if needed.

Edit: I just found out that the same behaviour occurs when breaking stone bricks. Cracked stone bricks or mossy bricks work fine.

 

[matthenry]

So for anyone running into this: in my case Conquest Reforged was the reason. I took all my courage and removed it from my existing world and voilá, all stones can be mined again.

Thanks for reading though!

Oh, I forgot to mention I'm playing Minecraft 1.12.