Spigot 1.13.1 latest
EHM 1.13-alpha

The following mining mechanics are enabled on my server:

1. Stone can be mined only with iron and diamond pickaxes, and they wear out quickly.
2. Mining ore turns surrounding stone to cobble.
3. Cobble and dirt may cave in when disturbed.
4. Grass may cave in when disturbed.

Test results:

1. Confirmed.
2. Confirmed.
3. Cobble and dirt cave in.
4. FAIL: Grass does not cave in, probably a consequence of the material name change to grass_block.

Hmm, I'm guessing the grass caving in when disturbed is part of Additional Falling Blocks?

Though you can add GRASS_BLOCK to the config, I don't know if it will work because it may not have an ID... since this is one of the many classes that uses that abstracted BlockType class which is backed by an int id.

If this is the case, then probably just best to link to issue 128 and close, since it has to do with the underlying abstracted BlockType it's using instead of the feature itself.

Hmm, I'm guessing the grass caving in when disturbed is part of Additional Falling Blocks?

I think so. Whatever you think is best resolution. I'm just reporting what I find. :)

Wow, I'm surprised that stuff works. Neato.

I'm going to guess that adding GRASS_BLOCK to the config doesn't work since the material name was renamed and thus CB likely did not migrate its integer id.

I'm going to guess that adding GRASS_BLOCK to the config doesn't work since the material name was renamed and thus CB likely did not migrate its integer id.

Actually, that works just fine. Easy-peasy.

Cool. I guess that'll solve any other issues that relate to GRASS_BLOCK and other expected types not working.