Program: 30599
Project: 30599
Buggy source:
public static boolean place(ItemStack held,int x,int y,int z,int face,EntityPlayer player,World world,PlaceType pass,int depth){
  if (depth > 3)   return false;
  ForgeDirection side=ForgeDirection.getOrientation(face);
  if (held != null && Platform.isWrench(player,held,x,y,z) && player.isSneaking()) {
    Block block=world.getBlock(x,y,z);
    TileEntity tile=world.getTileEntity(x,y,z);
    IPartHost host=null;
    if (tile instanceof IPartHost)     host=(IPartHost)tile;
    if (host != null) {
      if (!world.isRemote) {
        LookDirection dir=Platform.getPlayerRay(player);
        MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
        if (mop != null) {
          List<ItemStack> is=new LinkedList();
          SelectedPart sp=selectPart(player,host,mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ));
          if (sp.part != null) {
            is.add(sp.part.getItemStack(PartItemStack.Wrench));
            sp.part.getDrops(is,true);
            host.removePart(sp.side,false);
          }
          if (sp.facade != null) {
            is.add(sp.facade.getItemStack());
            host.getFacadeContainer().removeFacade(host,sp.side);
            Platform.notifyBlocksOfNeighbors(world,x,y,z);
          }
          if (host.isEmpty())           host.cleanup();
          if (is != null && !is.isEmpty()) {
            Platform.spawnDrops(world,x,y,z,is);
          }
        }
      }
 else {
        player.swingItem();
        try {
          NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
        }
 catch (        IOException e) {
          AELog.error(e);
        }
      }
      return true;
    }
    return false;
  }
  TileEntity tile=world.getTileEntity(x,y,z);
  IPartHost host=null;
  if (tile instanceof IPartHost)   host=(IPartHost)tile;
  if (held != null) {
    IFacadePart fp=isFacade(held,side);
    if (fp != null) {
      if (host != null) {
        if (!world.isRemote) {
          if (host.getPart(ForgeDirection.UNKNOWN) == null)           return false;
          if (host.canAddPart(held,side)) {
            if (host.getFacadeContainer().addFacade(fp)) {
              host.markForUpdate();
              if (!player.capabilities.isCreativeMode) {
                held.stackSize--;
                if (held.stackSize == 0) {
                  player.inventory.mainInventory[player.inventory.currentItem]=null;
                  MinecraftForge.EVENT_BUS.post(new PlayerDestroyItemEvent(player,held));
                }
              }
              return true;
            }
          }
        }
 else {
          player.swingItem();
          try {
            NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
            return true;
          }
 catch (          IOException e) {
            AELog.error(e);
          }
        }
      }
      return false;
    }
  }
  if (host == null && tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))   host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
{
    Block block=world.getBlock(x,y,z);
    if (host != null && player.isSneaking() && block != null) {
      LookDirection dir=Platform.getPlayerRay(player);
      MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
      if (mop != null) {
        mop.hitVec=mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ);
        SelectedPart sPart=selectPart(player,host,mop.hitVec);
        if (sPart != null && sPart.part != null)         if (sPart.part.onShiftActivate(player,mop.hitVec)) {
          if (world.isRemote) {
            try {
              NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
            }
 catch (            IOException e) {
              AELog.error(e);
            }
          }
          return true;
        }
      }
    }
  }
  if (held == null || !(held.getItem() instanceof IPartItem))   return false;
  int te_x=x;
  int te_y=y;
  int te_z=z;
  if (host == null && pass == PlaceType.PLACE_ITEM) {
    ItemStack is=AEApi.instance().blocks().blockMultiPart.stack(1);
    ItemBlock ib=(ItemBlock)is.getItem();
    ForgeDirection offset=ForgeDirection.UNKNOWN;
    Block blkID=world.getBlock(x,y,z);
    if (blkID != null && !blkID.isReplaceable(world,x,y,z)) {
      offset=side;
      if (Platform.isServer())       side=side.getOpposite();
    }
    te_x=x + offset.offsetX;
    te_y=y + offset.offsetY;
    te_z=z + offset.offsetZ;
    tile=world.getTileEntity(te_x,te_y,te_z);
    if (tile instanceof IPartHost)     host=(IPartHost)tile;
    if (host == null && tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))     host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
    if (host == null && AEApi.instance().blocks().blockMultiPart.block().canPlaceBlockAt(world,te_x,te_y,te_z) && ib.placeBlockAt(is,player,world,te_x,te_y,te_z,side.ordinal(),0.5f,0.5f,0.5f,0)) {
      if (!world.isRemote) {
        tile=world.getTileEntity(te_x,te_y,te_z);
        if (tile instanceof IPartHost)         host=(IPartHost)tile;
        pass=PlaceType.INTERACT_SECOND_PASS;
      }
 else {
        player.swingItem();
        try {
          NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
        }
 catch (        IOException e) {
          AELog.error(e);
        }
        return true;
      }
    }
 else     if (host != null && !host.canAddPart(held,side))     return false;
  }
  if (host == null)   return false;
  if (!host.canAddPart(held,side)) {
    if (pass == PlaceType.INTERACT_FIRST_PASS || pass == PlaceType.PLACE_ITEM) {
      ForgeDirection offset=side;
      te_x=x + offset.offsetX;
      te_y=y + offset.offsetY;
      te_z=z + offset.offsetZ;
      Block blkID=world.getBlock(te_x,te_y,te_z);
      tile=world.getTileEntity(te_x,te_y,te_z);
      if (tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))       host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
      if ((blkID == null || blkID.isReplaceable(world,te_x,te_y,te_z) || host != null) && offset != ForgeDirection.UNKNOWN)       return place(held,te_x,te_y,te_z,side.getOpposite().ordinal(),player,world,pass == PlaceType.INTERACT_FIRST_PASS ? PlaceType.INTERACT_SECOND_PASS : PlaceType.PLACE_ITEM,depth + 1);
    }
    return false;
  }
  if (!world.isRemote) {
    Block block=world.getBlock(x,y,z);
    LookDirection dir=Platform.getPlayerRay(player);
    MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
    if (mop != null) {
      SelectedPart sp=selectPart(player,host,mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ));
      if (sp.part != null) {
        if (!player.isSneaking() && sp.part.onActivate(player,mop.hitVec))         return false;
      }
    }
    ForgeDirection mySide=host.addPart(held,side,player);
    if (mySide != null) {
      SoundType ss=AEApi.instance().blocks().blockMultiPart.block().stepSound;
      world.playSoundEffect(0.5 + x,0.5 + y,0.5 + z,ss.func_150496_b(),(ss.getVolume() + 1.0F) / 2.0F,ss.getPitch() * 0.8F);
      if (!player.capabilities.isCreativeMode) {
        held.stackSize--;
        if (held.stackSize == 0) {
          player.inventory.mainInventory[player.inventory.currentItem]=null;
          MinecraftForge.EVENT_BUS.post(new PlayerDestroyItemEvent(player,held));
        }
      }
    }
  }
 else {
    player.swingItem();
    try {
      NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
    }
 catch (    IOException e) {
      AELog.error(e);
    }
  }
  return true;
}

Fixed version (ground truth):
public static boolean place(ItemStack held,int x,int y,int z,int face,EntityPlayer player,World world,PlaceType pass,int depth){
  if (depth > 3)   return false;
  ForgeDirection side=ForgeDirection.getOrientation(face);
  if (held != null && Platform.isWrench(player,held,x,y,z) && player.isSneaking()) {
    Block block=world.getBlock(x,y,z);
    TileEntity tile=world.getTileEntity(x,y,z);
    IPartHost host=null;
    if (tile instanceof IPartHost)     host=(IPartHost)tile;
    if (host != null) {
      if (!world.isRemote) {
        LookDirection dir=Platform.getPlayerRay(player);
        MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
        if (mop != null) {
          List<ItemStack> is=new LinkedList();
          SelectedPart sp=selectPart(player,host,mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ));
          if (sp.part != null) {
            is.add(sp.part.getItemStack(PartItemStack.Wrench));
            sp.part.getDrops(is,true);
            host.removePart(sp.side,false);
          }
          if (sp.facade != null) {
            is.add(sp.facade.getItemStack());
            host.getFacadeContainer().removeFacade(host,sp.side);
            Platform.notifyBlocksOfNeighbors(world,x,y,z);
          }
          if (host.isEmpty())           host.cleanup();
          if (is != null && !is.isEmpty()) {
            Platform.spawnDrops(world,x,y,z,is);
          }
        }
      }
 else {
        player.swingItem();
        try {
          NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
        }
 catch (        IOException e) {
          AELog.error(e);
        }
      }
      return true;
    }
    return false;
  }
  TileEntity tile=world.getTileEntity(x,y,z);
  IPartHost host=null;
  if (tile instanceof IPartHost)   host=(IPartHost)tile;
  if (held != null) {
    IFacadePart fp=isFacade(held,side);
    if (fp != null) {
      if (host != null) {
        if (!world.isRemote) {
          if (host.getPart(ForgeDirection.UNKNOWN) == null)           return false;
          if (host.canAddPart(held,side)) {
            if (host.getFacadeContainer().addFacade(fp)) {
              host.markForUpdate();
              if (!player.capabilities.isCreativeMode) {
                held.stackSize--;
                if (held.stackSize == 0) {
                  player.inventory.mainInventory[player.inventory.currentItem]=null;
                  MinecraftForge.EVENT_BUS.post(new PlayerDestroyItemEvent(player,held));
                }
              }
              return true;
            }
          }
        }
 else {
          player.swingItem();
          try {
            NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
            return true;
          }
 catch (          IOException e) {
            AELog.error(e);
          }
        }
      }
      return false;
    }
  }
  if (host == null && tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))   host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
  if (host == null && tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.ImmibisMicroblocks))   host=((IImmibisMicroblocks)AppEng.instance.getIntegration(IntegrationType.ImmibisMicroblocks)).getOrCreateHost(player,face,tile);
{
    Block block=world.getBlock(x,y,z);
    if (host != null && player.isSneaking() && block != null) {
      LookDirection dir=Platform.getPlayerRay(player);
      MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
      if (mop != null) {
        mop.hitVec=mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ);
        SelectedPart sPart=selectPart(player,host,mop.hitVec);
        if (sPart != null && sPart.part != null)         if (sPart.part.onShiftActivate(player,mop.hitVec)) {
          if (world.isRemote) {
            try {
              NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
            }
 catch (            IOException e) {
              AELog.error(e);
            }
          }
          return true;
        }
      }
    }
  }
  if (held == null || !(held.getItem() instanceof IPartItem))   return false;
  int te_x=x;
  int te_y=y;
  int te_z=z;
  if (host == null && pass == PlaceType.PLACE_ITEM) {
    ItemStack is=AEApi.instance().blocks().blockMultiPart.stack(1);
    ItemBlock ib=(ItemBlock)is.getItem();
    ForgeDirection offset=ForgeDirection.UNKNOWN;
    Block blkID=world.getBlock(x,y,z);
    if (blkID != null && !blkID.isReplaceable(world,x,y,z)) {
      offset=side;
      if (Platform.isServer())       side=side.getOpposite();
    }
    te_x=x + offset.offsetX;
    te_y=y + offset.offsetY;
    te_z=z + offset.offsetZ;
    tile=world.getTileEntity(te_x,te_y,te_z);
    if (tile instanceof IPartHost)     host=(IPartHost)tile;
    if (host == null && tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))     host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
    if (host == null && AEApi.instance().blocks().blockMultiPart.block().canPlaceBlockAt(world,te_x,te_y,te_z) && ib.placeBlockAt(is,player,world,te_x,te_y,te_z,side.ordinal(),0.5f,0.5f,0.5f,0)) {
      if (!world.isRemote) {
        tile=world.getTileEntity(te_x,te_y,te_z);
        if (tile instanceof IPartHost)         host=(IPartHost)tile;
        pass=PlaceType.INTERACT_SECOND_PASS;
      }
 else {
        player.swingItem();
        try {
          NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
        }
 catch (        IOException e) {
          AELog.error(e);
        }
        return true;
      }
    }
 else     if (host != null && !host.canAddPart(held,side))     return false;
  }
  if (host == null)   return false;
  if (!host.canAddPart(held,side)) {
    if (pass == PlaceType.INTERACT_FIRST_PASS || pass == PlaceType.PLACE_ITEM) {
      ForgeDirection offset=side;
      te_x=x + offset.offsetX;
      te_y=y + offset.offsetY;
      te_z=z + offset.offsetZ;
      Block blkID=world.getBlock(te_x,te_y,te_z);
      tile=world.getTileEntity(te_x,te_y,te_z);
      if (tile != null && AppEng.instance.isIntegrationEnabled(IntegrationType.FMP))       host=((IFMP)AppEng.instance.getIntegration(IntegrationType.FMP)).getOrCreateHost(tile);
      if ((blkID == null || blkID.isReplaceable(world,te_x,te_y,te_z) || host != null) && offset != ForgeDirection.UNKNOWN)       return place(held,te_x,te_y,te_z,side.getOpposite().ordinal(),player,world,pass == PlaceType.INTERACT_FIRST_PASS ? PlaceType.INTERACT_SECOND_PASS : PlaceType.PLACE_ITEM,depth + 1);
    }
    return false;
  }
  if (!world.isRemote) {
    Block block=world.getBlock(x,y,z);
    LookDirection dir=Platform.getPlayerRay(player);
    MovingObjectPosition mop=block.collisionRayTrace(world,x,y,z,dir.a,dir.b);
    if (mop != null) {
      SelectedPart sp=selectPart(player,host,mop.hitVec.addVector(-mop.blockX,-mop.blockY,-mop.blockZ));
      if (sp.part != null) {
        if (!player.isSneaking() && sp.part.onActivate(player,mop.hitVec))         return false;
      }
    }
    ForgeDirection mySide=host.addPart(held,side,player);
    if (mySide != null) {
      SoundType ss=AEApi.instance().blocks().blockMultiPart.block().stepSound;
      world.playSoundEffect(0.5 + x,0.5 + y,0.5 + z,ss.func_150496_b(),(ss.getVolume() + 1.0F) / 2.0F,ss.getPitch() * 0.8F);
      if (!player.capabilities.isCreativeMode) {
        held.stackSize--;
        if (held.stackSize == 0) {
          player.inventory.mainInventory[player.inventory.currentItem]=null;
          MinecraftForge.EVENT_BUS.post(new PlayerDestroyItemEvent(player,held));
        }
      }
    }
  }
 else {
    player.swingItem();
    try {
      NetworkHandler.instance.sendToServer(new PacketPartPlacement(x,y,z,face));
    }
 catch (    IOException e) {
      AELog.error(e);
    }
  }
  return true;
}