I also tried adding knockout as a state instead of 0 HP, but it seems it doesn't matter what kind of way you die, you just don't get an enemy attack animation if an actor dies.
Testing on my end (though it may be because I already fixed it), I haven't noticed this issue only that the attack itself will no longer play on the battler when it dies and instead the death animation will play.
Yup I'm having issues navigating the AI behavior settings but this is fully fixed it seems, when I removed the 'ability' locks (What you needed to qualify for using the ability for enemies) it worked just fine, just gonna need to tinker to find a good AI setting etc
