Pounce had that issue since forever, but one of them modders denied it or rather said he wasn‘t able to recreate that bug.
I personally think that issue arises when you get hit or attacked while you‘re pouncing on an enemy, letting the game think the hit animation was played but is still locked in the attack animation, basically never showing the hit animation. But that‘s just my guess and it‘s 100% not scientific.
The only thing you can do to avoid this issue is getting lots of attack speed, so your attack is faster than the enemies can attack you. And of course defense.