Program: 86057
Project: 86057
Buggy source:
@EventHandler(priority=EventPriority.HIGHEST) public void onMove(PlayerMoveEvent event){
  try {
    final Player p=event.getPlayer();
    if (pli.global_players.containsKey(p.getName())) {
      final Arena a=pli.global_players.get(p.getName());
      if (!pli.global_lost.containsKey(p.getName()) && !pli.global_arcade_spectator.containsKey(p.getName())) {
        if (a.getArenaState() == ArenaState.INGAME) {
          if (p.getLocation().getBlockY() + loseY < a.getSpawns().get(0).getBlockY()) {
            if (a.getArenaType() == ArenaType.JUMPNRUN) {
              Util.teleportPlayerFixed(p,a.getSpawns().get(0));
            }
 else {
              a.spectate(p.getName());
            }
            return;
          }
          if (a.getBoundaries() != null) {
            if (!a.getBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
          }
        }
 else         if (a.getArenaState() == ArenaState.STARTING || a.getArenaState() == ArenaState.JOIN) {
          if (!a.startedIngameCountdown) {
            if (p.getLocation().getBlockY() < 0) {
              try {
                Util.teleportPlayerFixed(p,a.getWaitingLobbyTemp());
              }
 catch (              Exception e) {
                System.out.println("String_Node_Str" + a.getInternalName() + "String_Node_Str"+ e.getMessage());
              }
            }
            if (a.getLobbyBoundaries() != null) {
              if (!a.getLobbyBoundaries().containsLocWithoutY(p.getLocation())) {
                Vector direction=a.getWaitingLobbyTemp().toVector().subtract(p.getLocation().toVector()).normalize();
                p.setVelocity(direction);
                if (p.isInsideVehicle()) {
                  p.getVehicle().setVelocity(direction.multiply(2D));
                }
                p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
              }
            }
          }
        }
      }
 else {
        if (a.getArenaState() == ArenaState.INGAME) {
          if (pli.spectator_move_y_lock && event.getPlayer().getLocation().getBlockY() < (a.getSpawns().get(0).getBlockY() + 30D) || event.getPlayer().getLocation().getBlockY() > (a.getSpawns().get(0).getBlockY() + 30D)) {
            final float b=p.getLocation().getYaw();
            final float c=p.getLocation().getPitch();
            Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin,new Runnable(){
              @Override public void run(){
                p.setAllowFlight(true);
                p.setFlying(true);
                if (p.isInsideVehicle()) {
                  Entity ent=p.getVehicle();
                  p.leaveVehicle();
                  ent.eject();
                }
                p.teleport(new Location(p.getWorld(),p.getLocation().getBlockX(),(a.getSpawns().get(0).getBlockY() + 30D),p.getLocation().getBlockZ(),b,c));
              }
            }
,1);
            return;
          }
          if (a.getSpecBoundaries() != null) {
            if (!a.getSpecBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).clone().add(0D,30D,0D).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
            return;
          }
          if (a.getBoundaries() != null) {
            if (!a.getBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).clone().add(0D,30D,0D).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
          }
        }
      }
    }
  }
 catch (  Exception e) {
    for (    StackTraceElement et : e.getStackTrace()) {
      System.out.println(et);
    }
  }
}

Fixed version (ground truth):
@EventHandler(priority=EventPriority.HIGHEST) public void onMove(PlayerMoveEvent event){
  try {
    final Player p=event.getPlayer();
    if (pli.global_players.containsKey(p.getName())) {
      final Arena a=pli.global_players.get(p.getName());
      if (!pli.global_lost.containsKey(p.getName()) && !pli.global_arcade_spectator.containsKey(p.getName())) {
        if (a.getArenaState() == ArenaState.INGAME) {
          if (p.getLocation().getBlockY() + loseY < a.getSpawns().get(0).getBlockY()) {
            if (a.getArenaType() == ArenaType.JUMPNRUN) {
              Util.teleportPlayerFixed(p,a.getSpawns().get(0));
            }
 else {
              a.spectate(p.getName());
              for (              String p_ : a.getAllPlayers()) {
                if (Validator.isPlayerOnline(p_)) {
                  Bukkit.getPlayer(p_).sendMessage(pli.getMessagesConfig().player_died.replaceAll("String_Node_Str",p.getName()));
                }
              }
            }
            return;
          }
          if (a.getBoundaries() != null) {
            if (!a.getBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
          }
        }
 else         if (a.getArenaState() == ArenaState.STARTING || a.getArenaState() == ArenaState.JOIN) {
          if (!a.startedIngameCountdown) {
            if (p.getLocation().getBlockY() < 0) {
              try {
                Util.teleportPlayerFixed(p,a.getWaitingLobbyTemp());
              }
 catch (              Exception e) {
                System.out.println("String_Node_Str" + a.getInternalName() + "String_Node_Str"+ e.getMessage());
              }
            }
            if (a.getLobbyBoundaries() != null) {
              if (!a.getLobbyBoundaries().containsLocWithoutY(p.getLocation())) {
                Vector direction=a.getWaitingLobbyTemp().toVector().subtract(p.getLocation().toVector()).normalize();
                p.setVelocity(direction);
                if (p.isInsideVehicle()) {
                  p.getVehicle().setVelocity(direction.multiply(2D));
                }
                p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
              }
            }
          }
        }
      }
 else {
        if (a.getArenaState() == ArenaState.INGAME) {
          if (pli.spectator_move_y_lock && event.getPlayer().getLocation().getBlockY() < (a.getSpawns().get(0).getBlockY() + 30D) || event.getPlayer().getLocation().getBlockY() > (a.getSpawns().get(0).getBlockY() + 30D)) {
            final float b=p.getLocation().getYaw();
            final float c=p.getLocation().getPitch();
            Bukkit.getServer().getScheduler().scheduleSyncDelayedTask(plugin,new Runnable(){
              @Override public void run(){
                p.setAllowFlight(true);
                p.setFlying(true);
                if (p.isInsideVehicle()) {
                  Entity ent=p.getVehicle();
                  p.leaveVehicle();
                  ent.eject();
                }
                p.teleport(new Location(p.getWorld(),p.getLocation().getBlockX(),(a.getSpawns().get(0).getBlockY() + 30D),p.getLocation().getBlockZ(),b,c));
              }
            }
,1);
            return;
          }
          if (a.getSpecBoundaries() != null) {
            if (!a.getSpecBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).clone().add(0D,30D,0D).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
            return;
          }
          if (a.getBoundaries() != null) {
            if (!a.getBoundaries().containsLocWithoutY(p.getLocation())) {
              Vector direction=a.getSpawns().get(0).clone().add(0D,30D,0D).toVector().subtract(p.getLocation().toVector()).normalize();
              p.setVelocity(direction);
              if (p.isInsideVehicle()) {
                p.getVehicle().setVelocity(direction.multiply(2D));
              }
              p.playEffect(p.getLocation(),Effect.POTION_BREAK,5);
            }
          }
        }
      }
    }
  }
 catch (  Exception e) {
    for (    StackTraceElement et : e.getStackTrace()) {
      System.out.println(et);
    }
  }
}