When I hit mobs with the drill (tried cows and spiders) they don't take damage. I tried both the standard and the diamond versions, charged and uncharged. Chainsaw seems to work fine though.
That's probably because if you bothered to check the wiki beforehand you would have seen that both types of drills are meant for mining, not hitting things
I'm aware they're for drilling, but they used to be able to hit mobs. It wasn't as good as a sword, but at least it did some damage. Now they don't do any at all. There's no reference to that change on the wiki or the 1.106 change log, hence the bug.
He's saying that the mobs don't take ANY damage. I think sticking a diamond-tipped mining drill through a zombie's skull should probably do a little bit of damage XD