Program: 145710
Project: 145710
Buggy source:
public boolean useItem(int slot){
  if (fakePlayer == null) {
    fakePlayer=new EntityFakePlayer(worldObj,this,xCoord,yCoord,zCoord,worldObj.getBlockMetadata(xCoord,yCoord,zCoord));
  }
  Item item=this.getStackInSlot(slot).getItem();
  int i=xCoord, j=yCoord, k=zCoord, meta=worldObj.getBlockMetadata(xCoord,yCoord,zCoord);
  i=AdvancedDispensersLib.INSTANCE.getI(meta,i);
  j=AdvancedDispensersLib.INSTANCE.getJ(meta,j);
  k=AdvancedDispensersLib.INSTANCE.getK(meta,k);
  Block user=worldObj.getBlock(xCoord,yCoord,zCoord);
  int userMeta=worldObj.getBlockMetadata(xCoord,yCoord,zCoord);
  AxisAlignedBB rect=null;
  int deltaX=xCoord - i, deltaY=yCoord - j, deltaZ=zCoord - k;
  if (deltaX > 0 || deltaY > 0 || deltaZ > 0) {
    rect=AxisAlignedBB.getBoundingBox(xCoord - deltaX * 4 - 0.1,yCoord - deltaY * 4 - 0.1,zCoord - deltaZ * 4 - 0.1,xCoord + 0.1,yCoord + 0.1,zCoord + 0.1);
  }
 else {
    rect=AxisAlignedBB.getBoundingBox(xCoord - 0.1,yCoord - 0.1,zCoord - 0.1,xCoord + deltaX * 4 + 0.1,yCoord + deltaY * 4 + 0.1,zCoord + deltaZ * 4 + 0.1);
  }
  List<EntityLivingBase> near=worldObj.getEntitiesWithinAABB(EntitySheep.class,rect);
  for (  EntityLivingBase base : near) {
    if (item.itemInteractionForEntity(this.getStackInSlot(slot),fakePlayer,base)) {
      return true;
    }
  }
  if (item.onItemUseFirst(this.getStackInSlot(slot),fakePlayer,worldObj,i,j - 1,k,1,0.5f,0.5f,0.5f)) {
  }
 else   if (item.onItemUse(this.getStackInSlot(slot),fakePlayer,worldObj,i,j - 1,k,1,0.5f,0.5f,0.5f)) {
  }
 else {
    this.setInventorySlotContents(slot,item.onItemRightClick(this.getStackInSlot(slot),worldObj,fakePlayer));
  }
  AdvancedDispensersLib.INSTANCE.deleteEmptyStacks(this);
  return true;
}

Fixed version (ground truth):
public boolean useItem(int slot){
  if (fakePlayer == null) {
    fakePlayer=new EntityFakePlayer(worldObj,this,xCoord,yCoord,zCoord,worldObj.getBlockMetadata(xCoord,yCoord,zCoord));
  }
  Item item=this.getStackInSlot(slot).getItem();
  int i=xCoord, j=yCoord, k=zCoord, meta=worldObj.getBlockMetadata(xCoord,yCoord,zCoord);
  i=AdvancedDispensersLib.INSTANCE.getI(meta,i);
  j=AdvancedDispensersLib.INSTANCE.getJ(meta,j);
  k=AdvancedDispensersLib.INSTANCE.getK(meta,k);
  Block user=worldObj.getBlock(xCoord,yCoord,zCoord);
  int userMeta=worldObj.getBlockMetadata(xCoord,yCoord,zCoord);
  AxisAlignedBB rect=null;
  int deltaX=xCoord - i, deltaY=yCoord - j, deltaZ=zCoord - k;
  if (deltaX > 0 || deltaY > 0 || deltaZ > 0) {
    rect=AxisAlignedBB.getBoundingBox(xCoord - deltaX * 4 - 0.5,yCoord - deltaY * 4 - 0.5,zCoord - deltaZ * 4 - 0.5,xCoord + 0.5,yCoord + 0.5,zCoord + 0.5);
  }
 else {
    rect=AxisAlignedBB.getBoundingBox(xCoord - 0.5,yCoord - 0.5,zCoord - 0.5,xCoord - deltaX * 4 + 0.5,yCoord - deltaY * 4 + 0.5,zCoord - deltaZ * 4 + 0.5);
  }
  List<EntityLivingBase> near=worldObj.getEntitiesWithinAABB(EntitySheep.class,rect);
  for (  EntityLivingBase base : near) {
    if (item.itemInteractionForEntity(this.getStackInSlot(slot),fakePlayer,base)) {
      return true;
    }
  }
  if (item.onItemUseFirst(this.getStackInSlot(slot),fakePlayer,worldObj,i,j - 1,k,1,0.5f,0.5f,0.5f)) {
  }
 else   if (item.onItemUse(this.getStackInSlot(slot),fakePlayer,worldObj,i,j - 1,k,1,0.5f,0.5f,0.5f)) {
  }
 else {
    this.setInventorySlotContents(slot,item.onItemRightClick(this.getStackInSlot(slot),worldObj,fakePlayer));
  }
  AdvancedDispensersLib.INSTANCE.deleteEmptyStacks(this);
  return true;
}