Hi, I've been playing Medieval Minecraft with your modpack included. I've realised that there is no Host Biome generation in my world. The version I've been playing on is 1.18.1, and trying it out in creative, even glyphs don't work in corroding the ground or creating the biome. Is there any way to enable the generation of it without starting a new world?

no Host Biome generation in my world
glyphs don't work in corroding the ground

Can you check the values of hostBiomeSpawnRate and canUseMorbusCorruptionItems at the config (located @ .minecraft/config/magicfungi.json)? If their values are 0 and false respectively, the modpack authors intentionally disabled the features.