I haven’t been able to duplicate the occlusion issue, unfortunately enough, but from what i remember it happened when a sound was occluded by foliage. Swinging the camera from behind to in front of the foliage would make the sound start over.
I’m currently setting up some of the sound cues in a blank project and will migrate them over to see if that fixes anything, along with setting up a few concurrency groups and making the priority of the roars higher.