Using "Attack" to damage entities - MalmoEnv

[jerem-yp]

I'm having trouble issuing commands that deal damage to entities while using the malmoenv package. Specifically, if I use the "attack" command, my agent will be able to break the block in front of it. But, the agent cannot deal damage to a mob standing right in front of it - I see the "sword cooldown" animation, but the entity is not damaged/does not take damage. However, if I manually left-click on the window, I'm able to deal damage.

My XML for the zombie:

<DrawEntity type="Zombie" x="0" y="4" z="0"/>

My XML for the agent's commands (I'm only testing attack and turn at the moment):

            <DiscreteMovementCommands>
                <ModifierList type="allow-list">
                    <command>attack</command>
                    <command>turn</command>
                </ModifierList>
            </DiscreteMovementCommands>

Is this a setup issue, or is this a known issue with the "attack" ? If it is a setup issue, could you point me in the direction to fix this? Thank you!