SendBlockDamage.java

public void sendBlockDamage(Player player, Location location, float progress) {
    int locationId = location.getBlockX() + location.getBlockY() + location.getBlockZ(); // not perfect, could be better (some blocks have duplicate ids)
    PacketContainer packet = manager.createPacket(PacketType.Play.Server.BLOCK_BREAK_ANIMATION);
    // set entity ID to the location so the block break animation doesn't break (this is why we need packets).
    packet.getIntegers().write(0, locationId); 
    packet.getBlockPositionModifier().write(0, new BlockPosition(location.toVector())); // set the block location
    packet.getIntegers().write(1, getBlockStage(location)); // set the damage to blockStage
    try {
        manager.sendServerPacket(player, packet);
    } catch (InvocationTargetException e) {
        e.printStackTrace(); // the packet was unable to send.
    }
}