Problem with sounds

We're facing problem with sounds. As in mc 1.12 there were sounds for the fang attack by the evoker and the opening and closing sound of shulker boxes. There's a bit sound of opening and closing of shulker boxes but problem with the fang attack of evoker as during the fang attack when evoker releases the fangs there is no sound which was also shown in the trailer of mc 1.12 exploration update. I don't know is there a problem with the sounds or they're not added. Please work on sounds as it also effects the gameplay though!