I think what's happening here is that the melee attack range of the Killer Bunny wasn't readjusted when it and the other rabbits were made smaller. Its attacking range isn't proportional to its now smaller size.
But, fixing this bug should be pretty simple. 😉
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The killer bunny is an unfinished, unsupported part of the game right now.

I've experienced that they can attack you through blocks, too.

That's fine for me. Thank you for replying, Searge! 🙂