Program: 96713
Project: 96713
Buggy source:
@Override public void handle(GlowSession session,DiggingMessage message){
  final GlowPlayer player=session.getPlayer();
  GlowWorld world=player.getWorld();
  GlowBlock block=world.getBlockAt(message.getX(),message.getY(),message.getZ());
  BlockFace face=BlockPlacementHandler.convertFace(message.getFace());
  ItemStack holding=player.getItemInHand();
  boolean blockBroken=false;
  boolean revert=false;
  if (message.getState() == DiggingMessage.START_DIGGING) {
    org.dragonet.DragonetServer.instance().getRhino().useItem(message.getX(),message.getY(),message.getZ(),face.name(),player.getWorld().getBlockAt(message.getX(),message.getY(),message.getZ()).getType().name(),player);
    Action action=Action.LEFT_CLICK_BLOCK;
    Block eventBlock=block;
    if (player.getLocation().distanceSquared(block.getLocation()) > 36 || block.getTypeId() == 0) {
      action=Action.LEFT_CLICK_AIR;
      eventBlock=null;
    }
    PlayerInteractEvent interactEvent=EventFactory.onPlayerInteract(player,action,eventBlock,face);
    if (!BlockPlacementHandler.selectResult(interactEvent.useItemInHand(),true)) {
      revert=true;
    }
 else {
      boolean instaBreak=player.getGameMode() == GameMode.CREATIVE;
      BlockDamageEvent damageEvent=new BlockDamageEvent(player,block,player.getItemInHand(),instaBreak);
      if (player.getGameMode() == GameMode.CREATIVE && holding != null && EnchantmentTarget.WEAPON.includes(holding.getType())) {
        damageEvent.setCancelled(true);
      }
      EventFactory.callEvent(damageEvent);
      if (damageEvent.isCancelled()) {
        revert=true;
      }
 else {
        blockBroken=damageEvent.getInstaBreak() || instaBreak;
      }
    }
  }
 else   if (message.getState() == DiggingMessage.FINISH_DIGGING) {
    blockBroken=true;
  }
 else   if (message.getState() == DiggingMessage.STATE_DROP_ITEM) {
    player.dropItemInHand(false);
    return;
  }
 else   if (message.getState() == DiggingMessage.STATE_DROP_ITEMSTACK) {
    player.dropItemInHand(true);
    return;
  }
 else {
    return;
  }
  if (blockBroken) {
    BlockBreakEvent breakEvent=EventFactory.callEvent(new BlockBreakEvent(block,player));
    if (breakEvent.isCancelled()) {
      BlockPlacementHandler.revert(player,block);
      return;
    }
    BlockType blockType=ItemTable.instance().getBlock(block.getType());
    if (blockType != null) {
      blockType.blockDestroy(player,block,face);
    }
    if (!block.isEmpty() && !block.isLiquid() && player.getGameMode() != GameMode.CREATIVE) {
      for (      ItemStack drop : block.getDrops(holding)) {
        GlowItem item=world.dropItemNaturally(block.getLocation(),drop);
        item.setPickupDelay(30);
        item.setBias(player);
      }
    }
    world.playEffectExceptTo(block.getLocation(),Effect.STEP_SOUND,block.getTypeId(),64,player);
    block.setType(Material.AIR);
  }
 else   if (revert) {
    BlockPlacementHandler.revert(player,block);
  }
}

Fixed version (ground truth):
@Override public void handle(GlowSession session,DiggingMessage message){
  final GlowPlayer player=session.getPlayer();
  GlowWorld world=player.getWorld();
  GlowBlock block=world.getBlockAt(message.getX(),message.getY(),message.getZ());
  BlockFace face=BlockPlacementHandler.convertFace(message.getFace());
  ItemStack holding=player.getItemInHand();
  boolean blockBroken=false;
  boolean revert=false;
  if (message.getState() == DiggingMessage.START_DIGGING) {
    Action action=Action.LEFT_CLICK_BLOCK;
    Block eventBlock=block;
    if (player.getLocation().distanceSquared(block.getLocation()) > 36 || block.getTypeId() == 0) {
      action=Action.LEFT_CLICK_AIR;
      eventBlock=null;
    }
    PlayerInteractEvent interactEvent=EventFactory.onPlayerInteract(player,action,eventBlock,face);
    if (!BlockPlacementHandler.selectResult(interactEvent.useItemInHand(),true)) {
      revert=true;
    }
 else {
      boolean instaBreak=player.getGameMode() == GameMode.CREATIVE;
      BlockDamageEvent damageEvent=new BlockDamageEvent(player,block,player.getItemInHand(),instaBreak);
      if (player.getGameMode() == GameMode.CREATIVE && holding != null && EnchantmentTarget.WEAPON.includes(holding.getType())) {
        damageEvent.setCancelled(true);
      }
      EventFactory.callEvent(damageEvent);
      if (damageEvent.isCancelled()) {
        revert=true;
      }
 else {
        blockBroken=damageEvent.getInstaBreak() || instaBreak;
      }
    }
  }
 else   if (message.getState() == DiggingMessage.FINISH_DIGGING) {
    blockBroken=true;
  }
 else   if (message.getState() == DiggingMessage.STATE_DROP_ITEM) {
    player.dropItemInHand(false);
    return;
  }
 else   if (message.getState() == DiggingMessage.STATE_DROP_ITEMSTACK) {
    player.dropItemInHand(true);
    return;
  }
 else {
    return;
  }
  if (blockBroken) {
    BlockBreakEvent breakEvent=EventFactory.callEvent(new BlockBreakEvent(block,player));
    if (breakEvent.isCancelled()) {
      BlockPlacementHandler.revert(player,block);
      return;
    }
    BlockType blockType=ItemTable.instance().getBlock(block.getType());
    if (blockType != null) {
      blockType.blockDestroy(player,block,face);
    }
    if (!block.isEmpty() && !block.isLiquid() && player.getGameMode() != GameMode.CREATIVE) {
      for (      ItemStack drop : block.getDrops(holding)) {
        GlowItem item=world.dropItemNaturally(block.getLocation(),drop);
        item.setPickupDelay(30);
        item.setBias(player);
      }
    }
    world.playEffectExceptTo(block.getLocation(),Effect.STEP_SOUND,block.getTypeId(),64,player);
    block.setType(Material.AIR);
  }
 else   if (revert) {
    BlockPlacementHandler.revert(player,block);
  }
}