Both the normal and diamond-tipped mining drills harvest mycelium blocks at the same rate as punching it with your hand. I suppose it's probably just a "whoops forgot to register it to mine mushroom grass" thing.
1.43 Bug: Mining Drill doesn't properly mine Mycelium (mushroom grass)
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Both the normal and diamond-tipped mining drills harvest mycelium blocks at the same rate as punching it with your hand. I suppose it's probably just a "whoops forgot to register it to mine mushroom grass" thing.
It's not a "whoops" really. Mycelium was introduced in MC 1.0.0 and IC2 1.42 was nothing more than a direct port from MC 1.8.1 to 1.0.0 and 1.43 was a number of bug fixes.
You should post this in suggestions.