Delightful dirt only spawns mobs appropriate for the biome it is in. This seems like obvious intended functionality. However, with the 1.18 update there are now biomes specific to caves. These new biomes contain no passive mobs (creatures) in their spawn list. This makes delightful dirt useless in almost any underground base.

I am making to suggest adding some kind of change related to the 1.18 cave biomes. Maybe an override to treat the cave biomes like a surface biome, or some kind of default list of mobs that will spawn regardless of what biome the delightful dirt is located in.

If you decide on specific functionality you would want to implement in order to solve this issue, but don't have the time to dedicate to working on it yourself, I can create a pull request that implements the agreed upon changes.

I second this, underground bases make it hard to use delightful dirt