We have a perimeter set up with sweet berry bushes to prevent hostile mobs from getting to villagers with a fence and at first mobs walked up to the fence and got stuck in berry bushes and eventually took enough damage to die. Since the newer bug fix updates hostile mobs are no longer taking damage when stuck in the sweet berry bushes. We play on my sisters realm with Xbox and PS4. Been happening for a couple weeks. It’s how we collect rotten flesh to trade with villagers. Also put animals on leads and pull them through a line of bushes and they did not take damage anymore.