Program: 156849
Project: 156849
Buggy source:
@Override public void update(){
  if (robot.getHeldItem() == null) {
    Collection<ItemStack> gateFilter=ActionRobotFilter.getGateFilterStacks(robot.getLinkedStation());
    if (gateFilter.size() != 0) {
      ArrayList<ItemStack> filteredFilter=new ArrayList<ItemStack>();
      for (      ItemStack tentative : gateFilter) {
        if (stackFilter.matches(tentative)) {
          filteredFilter.add(tentative);
        }
      }
      if (filteredFilter.size() > 0) {
        ArrayStackFilter arrayFilter=new ArrayStackFilter(filteredFilter.toArray(new ItemStack[filteredFilter.size()]));
        startDelegateAI(new AIRobotFetchAndEquipItemStack(robot,arrayFilter));
      }
 else {
        startDelegateAI(new AIRobotGotoSleep(robot));
      }
    }
 else {
      startDelegateAI(new AIRobotFetchAndEquipItemStack(robot,stackFilter));
    }
  }
 else {
    if (robot.getHeldItem().getItem() instanceof ItemSeeds) {
      startDelegateAI(new AIRobotSearchBlock(robot,new IBlockFilter(){
        @Override public boolean matches(        World world,        int x,        int y,        int z){
          return BuildCraftAPI.isFarmlandProperty.get(world,x,y,z) && robot.getRegistry().isTaken(new ResourceIdBlock(x,y,z)) && isAirAbove(world,x,y,z);
        }
      }
));
    }
 else {
      startDelegateAI(new AIRobotGotoRandomGroundBlock(robot,100,new IBlockFilter(){
        @Override public boolean matches(        World world,        int x,        int y,        int z){
          Block b=robot.worldObj.getBlock(x,y,z);
          return b instanceof BlockDirt || b instanceof BlockGrass;
        }
      }
,robot.getZoneToWork()));
    }
  }
}

Fixed version (ground truth):
@Override public void update(){
  if (robot.getHeldItem() == null) {
    Collection<ItemStack> gateFilter=ActionRobotFilter.getGateFilterStacks(robot.getLinkedStation());
    if (gateFilter.size() != 0) {
      ArrayList<ItemStack> filteredFilter=new ArrayList<ItemStack>();
      for (      ItemStack tentative : gateFilter) {
        if (stackFilter.matches(tentative)) {
          filteredFilter.add(tentative);
        }
      }
      if (filteredFilter.size() > 0) {
        ArrayStackFilter arrayFilter=new ArrayStackFilter(filteredFilter.toArray(new ItemStack[filteredFilter.size()]));
        startDelegateAI(new AIRobotFetchAndEquipItemStack(robot,arrayFilter));
      }
 else {
        startDelegateAI(new AIRobotGotoSleep(robot));
      }
    }
 else {
      startDelegateAI(new AIRobotFetchAndEquipItemStack(robot,stackFilter));
    }
  }
 else {
    if (robot.getHeldItem().getItem() instanceof ItemSeeds) {
      startDelegateAI(new AIRobotSearchBlock(robot,new IBlockFilter(){
        @Override public boolean matches(        World world,        int x,        int y,        int z){
          return BuildCraftAPI.isFarmlandProperty.get(world,x,y,z) && !robot.getRegistry().isTaken(new ResourceIdBlock(x,y,z)) && isAirAbove(world,x,y,z);
        }
      }
));
    }
 else {
      startDelegateAI(new AIRobotGotoRandomGroundBlock(robot,100,new IBlockFilter(){
        @Override public boolean matches(        World world,        int x,        int y,        int z){
          Block b=robot.worldObj.getBlock(x,y,z);
          return b instanceof BlockDirt || b instanceof BlockGrass;
        }
      }
,robot.getZoneToWork()));
    }
  }
}