Program: 22326
Project: 22326
Buggy source:
@SubscribeEvent public void burstZincPlate(LivingHurtEvent event){
  EntityLivingBase entity=event.getEntityLiving();
  float amount=event.getAmount();
  if (!invalidSources.contains(event.getSource())) {
    if (entity instanceof EntityPlayer && hasPower(entity,ZINC_CONSUMPTION)) {
      EntityPlayer player=(EntityPlayer)entity;
      float health=player.getHealth();
      float maxHealth=player.getMaxHealth();
      float halfOfMax=maxHealth / 2;
      if (amount >= halfOfMax || health <= halfOfMax) {
        ItemStack stackWithPlate=null;
        boolean hasZincPlate=false;
        for (int i=1; i < 5; i++) {
          ItemStack equipment=entity.getItemStackFromSlot(ItemStackUtility.getSlotFromIndex(i));
          if (equipment != null) {
            Item item=equipment.getItem();
            if (item instanceof ItemExosuitArmor) {
              ItemExosuitArmor armor=(ItemExosuitArmor)item;
              if (armor.hasPlates(equipment) && UtilPlates.getPlate(equipment.getTagCompound().getString("String_Node_Str")).getIdentifier().equals("String_Node_Str")) {
                stackWithPlate=equipment;
                hasZincPlate=true;
                break;
              }
            }
          }
        }
        if (hasZincPlate) {
          ItemStack zincPlates=ExosuitUpgradeItems.PlateItems.ZINC.createItemStack(2);
          World world=player.worldObj;
          drainSteam(player.getItemStackFromSlot(EntityEquipmentSlot.CHEST),ZINC_CONSUMPTION);
          UtilPlates.removePlate(stackWithPlate);
          EntityItem entityItem=new EntityItem(world,player.posX,player.posY,player.posZ,zincPlates);
          world.spawnEntityInWorld(entityItem);
          player.setHealth(health);
          player.performHurtAnimation();
          world.playSound(player.posX,player.posY,player.posZ,Steamcraft.SOUND_HISS,SoundCategory.PLAYERS,2F,0.9F,false);
          event.setCanceled(true);
        }
      }
    }
  }
}

Fixed version (ground truth):
@SubscribeEvent public void burstZincPlate(LivingHurtEvent event){
  EntityLivingBase entity=event.getEntityLiving();
  float amount=event.getAmount();
  if (!invalidSources.contains(event.getSource())) {
    if (entity instanceof EntityPlayer && hasPower(entity,ZINC_CONSUMPTION)) {
      EntityPlayer player=(EntityPlayer)entity;
      float health=player.getHealth();
      float maxHealth=player.getMaxHealth();
      float halfOfMax=maxHealth / 2;
      if (amount >= halfOfMax || health <= halfOfMax) {
        ItemStack stackWithPlate=null;
        boolean hasZincPlate=false;
        for (int i=1; i < 5; i++) {
          ItemStack equipment=entity.getItemStackFromSlot(ItemStackUtility.getSlotFromIndex(i));
          if (equipment != null) {
            Item item=equipment.getItem();
            if (item instanceof ItemExosuitArmor) {
              ItemExosuitArmor armor=(ItemExosuitArmor)item;
              if (armor.hasPlates(equipment) && UtilPlates.getPlate(equipment.getTagCompound().getString("String_Node_Str")).getIdentifier().equals("String_Node_Str")) {
                stackWithPlate=equipment;
                hasZincPlate=true;
                break;
              }
            }
          }
        }
        if (hasZincPlate) {
          ItemStack zincPlates=ExosuitUpgradeItems.PlateItems.ZINC_EXO.createItemStack(2);
          World world=player.worldObj;
          drainSteam(player.getItemStackFromSlot(EntityEquipmentSlot.CHEST),ZINC_CONSUMPTION);
          UtilPlates.removePlate(stackWithPlate);
          EntityItem entityItem=new EntityItem(world,player.posX,player.posY,player.posZ,zincPlates);
          world.spawnEntityInWorld(entityItem);
          player.setHealth(health);
          player.performHurtAnimation();
          world.playSound(player.posX,player.posY,player.posZ,Steamcraft.SOUND_HISS,SoundCategory.PLAYERS,2F,0.9F,false);
          event.setCanceled(true);
        }
      }
    }
  }
}