Program: 156476
Project: 156476
Buggy source:
/** 
 * Computes the PacketFluidUpdate packet for transmission to a client
 * @param initPacket everything is sent, no delta stuff ( first packet )
 * @param persistChange The render cache change is persisted
 * @return PacketFluidUpdate liquid update packet 
 */
private PacketFluidUpdate computeFluidUpdate(boolean initPacket,boolean persistChange){
  boolean changed=false;
  BitSet delta=new BitSet(8);
  FluidRenderData renderCacheCopy=this.renderCache;
  if (initPacket || (fluidType == null && renderCacheCopy.fluidID != 0) || (fluidType != null && renderCacheCopy.fluidID != fluidType.getFluid().getID())) {
    changed=true;
    renderCache.fluidID=fluidType != null ? fluidType.getFluid().getID() : 0;
    renderCache.color=fluidType != null ? fluidType.getFluid().getColor(fluidType) : 0;
    renderCache.flags=FluidRenderData.getFlags(fluidType);
    delta.set(0);
  }
  for (  int dir : orientations) {
    int pamount=renderCache.amount[dir];
    int camount=sections[dir].amount;
    int displayQty=(pamount * 4 + camount) / 5;
    if (displayQty == 0 && camount > 0 || initPacket) {
      displayQty=camount;
    }
    displayQty=Math.min(getCapacity(),displayQty);
    if (pamount != displayQty || initPacket) {
      changed=true;
      renderCache.amount[dir]=displayQty;
      delta.set(dir + 1);
    }
  }
  renderCacheCopy.flow=flow;
  for (int i=0; i < 6; i++) {
    if (renderCache.flow[i] != renderCacheCopy.flow[i]) {
      changed=true;
    }
  }
  if (persistChange) {
    this.renderCache=renderCacheCopy;
  }
  if (changed || initPacket) {
    PacketFluidUpdate packet=new PacketFluidUpdate(container,initPacket);
    packet.renderCache=renderCacheCopy;
    packet.delta=delta;
    packet.flow=renderCacheCopy.flow;
    return packet;
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Computes the PacketFluidUpdate packet for transmission to a client
 * @param initPacket everything is sent, no delta stuff ( first packet )
 * @param persistChange The render cache change is persisted
 * @return PacketFluidUpdate liquid update packet 
 */
private PacketFluidUpdate computeFluidUpdate(boolean initPacket,boolean persistChange){
  boolean changed=false;
  BitSet delta=new BitSet(8);
  FluidRenderData renderCacheCopy=this.renderCache;
  if (initPacket || (fluidType == null && renderCacheCopy.fluidID != 0) || (fluidType != null && renderCacheCopy.fluidID != fluidType.getFluid().getID())) {
    changed=true;
    renderCache.fluidID=fluidType != null ? fluidType.getFluid().getID() : 0;
    renderCache.color=fluidType != null ? fluidType.getFluid().getColor(fluidType) : -1;
    renderCache.flags=FluidRenderData.getFlags(fluidType);
    delta.set(0);
  }
  for (  int dir : orientations) {
    int pamount=renderCache.amount[dir];
    int camount=sections[dir].amount;
    int displayQty=(pamount * 4 + camount) / 5;
    if (displayQty == 0 && camount > 0 || initPacket) {
      displayQty=camount;
    }
    displayQty=Math.min(getCapacity(),displayQty);
    if (pamount != displayQty || initPacket) {
      changed=true;
      renderCache.amount[dir]=displayQty;
      delta.set(dir + 1);
    }
  }
  renderCacheCopy.flow=flow;
  for (int i=0; i < 6; i++) {
    if (renderCache.flow[i] != renderCacheCopy.flow[i]) {
      changed=true;
    }
  }
  if (persistChange) {
    this.renderCache=renderCacheCopy;
  }
  if (changed || initPacket) {
    PacketFluidUpdate packet=new PacketFluidUpdate(container,initPacket);
    packet.renderCache=renderCacheCopy;
    packet.delta=delta;
    packet.flow=renderCacheCopy.flow;
    return packet;
  }
  return null;
}