Modpack Version:
2.7.2 - (with Indium & Sodium, but I don't think they affect this)

The gunpowder blocks from Charm and BLAST both have the same recipe, so crafting it defaults to the Charm one.
Unfortunately the BLAST one is required in crafting recipes and the other one doesn't work.
The block IDs are: "charm:gunpowder_block" and "blast:gunpowder_block"

I've tried disabling the charm gunpowder block in both server & client config but this hasn't changed the behaviour.

was fixed with commit 609b98f