killing cricket in shallow water

Hi guys,
While standing in shallow water, when I have killed a cricket with thrust, I hear a splash sound and then the cricket disappears. The first time the cricket was in the shallow water. The second time, it was at the edge of the water while I was in the water hoping to prevent it from disappearing. Is this a feature or a bug?
While standing in shallow water, when I have killed a cricket with thrust, I hear a splash sound and then the cricket disappears. The first time the cricket was in the shallow water. The second time, it was at the edge of the water while I was in the water hoping to prevent it from disappearing. Is this a feature or a bug?