Program: 27532
Project: 27532
Buggy source:
public static Class<? extends net.minecraftforge.fml.common.eventhandler.Event> getForgeEventClass(Event spongeEvent){
  final Class<? extends Event> clazz=spongeEvent.getClass();
  if (ChangeInventoryEvent.Pickup.Pre.class.isAssignableFrom(clazz)) {
    if (spongeEvent.getCause().root() instanceof Player) {
      return EntityItemPickupEvent.class;
    }
  }
  if (DestructEntityEvent.Death.class.isAssignableFrom(clazz)) {
    return LivingDeathEvent.class;
  }
  if (InteractBlockEvent.Primary.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractBlockEvent.Secondary.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractBlockEvent.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractEntityEvent.Secondary.class.isAssignableFrom(clazz)) {
    InteractEntityEvent event=(InteractEntityEvent)spongeEvent;
    if (event.getInteractionPoint().isPresent()) {
      return PlayerInteractEvent.EntityInteractSpecific.class;
    }
 else {
      return PlayerInteractEvent.EntityInteract.class;
    }
  }
  if (NotifyNeighborBlockEvent.class.isAssignableFrom(clazz)) {
    return BlockEvent.NeighborNotifyEvent.class;
  }
  if (ChangeBlockEvent.Place.class.isAssignableFrom(clazz)) {
    return BlockEvent.PlaceEvent.class;
  }
  if (ExplosionEvent.Pre.class.isAssignableFrom(clazz)) {
    return net.minecraftforge.event.world.ExplosionEvent.Start.class;
  }
  if (ExplosionEvent.Detonate.class.isAssignableFrom(clazz)) {
    return net.minecraftforge.event.world.ExplosionEvent.Detonate.class;
  }
  if (DropItemEvent.Destruct.class.isAssignableFrom(clazz)) {
    return LivingDropsEvent.class;
  }
  if (DropItemEvent.Dispense.class.isAssignableFrom(clazz)) {
    return ItemTossEvent.class;
  }
  if (ClientConnectionEvent.Join.class.isAssignableFrom(clazz)) {
    return PlayerLoggedInEvent.class;
  }
  if (ClientConnectionEvent.Disconnect.class.isAssignableFrom(clazz)) {
    return PlayerLoggedOutEvent.class;
  }
  if (RespawnPlayerEvent.class.isAssignableFrom(clazz)) {
    return PlayerRespawnEvent.class;
  }
  if (MoveEntityEvent.Teleport.class.isAssignableFrom(clazz)) {
    return EntityTravelToDimensionEvent.class;
  }
  if (SpawnEntityEvent.class.isAssignableFrom(clazz)) {
    return EntityJoinWorldEvent.class;
  }
  if (LoadWorldEvent.class.isAssignableFrom(clazz)) {
    return WorldEvent.Load.class;
  }
  if (UnloadWorldEvent.class.isAssignableFrom(clazz)) {
    return WorldEvent.Unload.class;
  }
  if (SaveWorldEvent.Post.class.isAssignableFrom(clazz)) {
    return WorldEvent.Save.class;
  }
  if (LoadChunkEvent.class.isAssignableFrom(clazz)) {
    return ChunkEvent.Load.class;
  }
  if (UnloadChunkEvent.class.isAssignableFrom(clazz)) {
    return ChunkEvent.Unload.class;
  }
  return null;
}

Fixed version (ground truth):
static Class<? extends net.minecraftforge.fml.common.eventhandler.Event> getForgeEventClass(Event spongeEvent){
  final Class<? extends Event> clazz=spongeEvent.getClass();
  if (ChangeInventoryEvent.Pickup.Pre.class.isAssignableFrom(clazz)) {
    if (spongeEvent.getCause().root() instanceof Player) {
      return EntityItemPickupEvent.class;
    }
  }
  if (DestructEntityEvent.Death.class.isAssignableFrom(clazz)) {
    return LivingDeathEvent.class;
  }
  if (InteractBlockEvent.Primary.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractBlockEvent.Secondary.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractBlockEvent.class.isAssignableFrom(clazz)) {
    return PlayerInteractEvent.class;
  }
  if (InteractEntityEvent.Secondary.class.isAssignableFrom(clazz)) {
    InteractEntityEvent event=(InteractEntityEvent)spongeEvent;
    if (event.getInteractionPoint().isPresent()) {
      return PlayerInteractEvent.EntityInteractSpecific.class;
    }
 else {
      return PlayerInteractEvent.EntityInteract.class;
    }
  }
  if (NotifyNeighborBlockEvent.class.isAssignableFrom(clazz)) {
    return BlockEvent.NeighborNotifyEvent.class;
  }
  if (ChangeBlockEvent.Place.class.isAssignableFrom(clazz)) {
    return BlockEvent.PlaceEvent.class;
  }
  if (ExplosionEvent.Pre.class.isAssignableFrom(clazz)) {
    return net.minecraftforge.event.world.ExplosionEvent.Start.class;
  }
  if (ExplosionEvent.Detonate.class.isAssignableFrom(clazz)) {
    return net.minecraftforge.event.world.ExplosionEvent.Detonate.class;
  }
  if (DropItemEvent.Destruct.class.isAssignableFrom(clazz)) {
    return LivingDropsEvent.class;
  }
  if (DropItemEvent.Dispense.class.isAssignableFrom(clazz)) {
    return ItemTossEvent.class;
  }
  if (DropItemEvent.Custom.class.isAssignableFrom(clazz)) {
    return ItemTossEvent.class;
  }
  if (ClientConnectionEvent.Join.class.isAssignableFrom(clazz)) {
    return PlayerLoggedInEvent.class;
  }
  if (ClientConnectionEvent.Disconnect.class.isAssignableFrom(clazz)) {
    return PlayerLoggedOutEvent.class;
  }
  if (RespawnPlayerEvent.class.isAssignableFrom(clazz)) {
    return PlayerRespawnEvent.class;
  }
  if (MoveEntityEvent.Teleport.class.isAssignableFrom(clazz)) {
    return EntityTravelToDimensionEvent.class;
  }
  if (SpawnEntityEvent.class.isAssignableFrom(clazz)) {
    return EntityJoinWorldEvent.class;
  }
  if (LoadWorldEvent.class.isAssignableFrom(clazz)) {
    return WorldEvent.Load.class;
  }
  if (UnloadWorldEvent.class.isAssignableFrom(clazz)) {
    return WorldEvent.Unload.class;
  }
  if (SaveWorldEvent.Post.class.isAssignableFrom(clazz)) {
    return WorldEvent.Save.class;
  }
  if (LoadChunkEvent.class.isAssignableFrom(clazz)) {
    return ChunkEvent.Load.class;
  }
  if (UnloadChunkEvent.class.isAssignableFrom(clazz)) {
    return ChunkEvent.Unload.class;
  }
  if (FishingEvent.Stop.class.isAssignableFrom(clazz)) {
    return ItemFishedEvent.class;
  }
  if (UseItemStackEvent.Start.class.isAssignableFrom(clazz)) {
    return LivingEntityUseItemEvent.Start.class;
  }
  if (UseItemStackEvent.Tick.class.isAssignableFrom(clazz)) {
    return LivingEntityUseItemEvent.Tick.class;
  }
  if (UseItemStackEvent.Stop.class.isAssignableFrom(clazz)) {
    return LivingEntityUseItemEvent.Stop.class;
  }
  if (UseItemStackEvent.Finish.class.isAssignableFrom(clazz)) {
    return LivingEntityUseItemEvent.Finish.class;
  }
  if (org.spongepowered.api.event.advancement.AdvancementEvent.Grant.class.isAssignableFrom(clazz)) {
    return AdvancementEvent.class;
  }
  return null;
}