Program: 178751
Project: 178751
Buggy source:
public void onPlayerMove(PlayerMoveEvent event){
  Player player=event.getPlayer();
  Vector vector=player.getVelocity();
  Location locTo=event.getTo();
  locTo=new Location(locTo.getWorld(),locTo.getBlockX(),locTo.getBlockY(),locTo.getBlockZ());
  Region regionTo=RegionManager.getRegion(event.getTo());
  Region regionFrom=RegionManager.getRegion(event.getFrom());
  PortalManager.checkPlayerMove(player,regionFrom,regionTo);
  if (regionTo.getBoolean(RegionSetting.ENABLE_GRILLS)) {
    Grill grill=GrillManager.insideBlocks.get(locTo);
    if (grill != null) {
      GrillManager.emancipate(player);
    }
  }
  Block blockIn=locTo.getBlock();
  Block blockUnder=blockIn.getFace(BlockFace.DOWN);
  Block blockStart=null;
  Integer horPower=Integer.parseInt(regionTo.getString(RegionSetting.FAITH_PLATE_POWER).split("String_Node_Str")[0]);
  String faithBlock=regionTo.getString(RegionSetting.FAITH_PLATE_BLOCK);
  Vector velocity=new Vector(0,Integer.parseInt(regionTo.getString(RegionSetting.FAITH_PLATE_POWER).split("String_Node_Str")[1]),0);
  if (blockIn.getType() == Material.STONE_PLATE && BlockUtil.compareBlockToString(blockUnder,faithBlock))   blockStart=blockUnder;
 else   blockStart=blockIn;
  if (blockStart != null) {
    BlockFace[] faces=new BlockFace[]{BlockFace.NORTH,BlockFace.SOUTH,BlockFace.EAST,BlockFace.WEST};
    BlockFace face=BlockUtil.getFaceOfMaterial(blockStart,faces,faithBlock);
    if (face != null) {
switch (face) {
case NORTH:
        velocity.setX(horPower);
      break;
case SOUTH:
    velocity.setX(-horPower);
  break;
case EAST:
velocity.setZ(horPower);
break;
case WEST:
velocity.setZ(-horPower);
break;
}
if (blockStart == blockUnder) {
velocity.setX(-velocity.getX());
velocity.setZ(-velocity.getZ());
}
player.setVelocity(velocity);
Util.PlayNote(player,4,5);
}
}
if (player.isInsideVehicle()) return;
Boolean permission=UserManager.teleportPermissionCache.get(player);
if (permission == null) {
permission=Permission.teleport(player);
UserManager.teleportPermissionCache.put(player,permission);
}
if (!permission) return;
Location out=EntityManager.teleport((Entity)player,locTo,vector);
if (out != null) {
event.setTo(out);
return;
}
Vector vec2=event.getTo().toVector();
Vector vec1=event.getFrom().toVector();
vector=vec2.subtract(vec1);
out=GelManager.useGel(player,locTo,vector);
if (out != null) event.setTo(out);
}

Fixed version (ground truth):
public void onPlayerMove(PlayerMoveEvent event){
  Player player=event.getPlayer();
  if (player.isInsideVehicle())   return;
  Location locTo=event.getTo();
  locTo=new Location(locTo.getWorld(),locTo.getBlockX(),locTo.getBlockY(),locTo.getBlockZ());
  Region regionTo=RegionManager.getRegion(event.getTo());
  Region regionFrom=RegionManager.getRegion(event.getFrom());
  Vector vec2=event.getTo().toVector();
  Vector vec1=event.getFrom().toVector();
  Vector vector=vec2.subtract(vec1);
  if (Config.DisabledWorlds.contains(locTo.getWorld().getName()))   return;
  PortalManager.checkPlayerMove(player,regionFrom,regionTo);
  if (regionTo.getBoolean(RegionSetting.ENABLE_GRILLS)) {
    Grill grill=GrillManager.insideBlocks.get(locTo);
    if (grill != null) {
      GrillManager.emancipate(player);
    }
  }
  if (regionTo.getBoolean(RegionSetting.ENABLE_AERIAL_FAITH_PLATES)) {
    Block blockIn=locTo.getBlock();
    Block blockUnder=blockIn.getFace(BlockFace.DOWN);
    Block blockStart=null;
    Integer horPower=Integer.parseInt(regionTo.getString(RegionSetting.FAITH_PLATE_POWER).split("String_Node_Str")[0]);
    String faithBlock=regionTo.getString(RegionSetting.FAITH_PLATE_BLOCK);
    Vector velocity=new Vector(0,Integer.parseInt(regionTo.getString(RegionSetting.FAITH_PLATE_POWER).split("String_Node_Str")[1]),0);
    if (blockIn.getType() == Material.STONE_PLATE && BlockUtil.compareBlockToString(blockUnder,faithBlock))     blockStart=blockUnder;
 else     blockStart=blockIn;
    if (blockStart != null) {
      BlockFace[] faces=new BlockFace[]{BlockFace.NORTH,BlockFace.SOUTH,BlockFace.EAST,BlockFace.WEST};
      BlockFace face=BlockUtil.getFaceOfMaterial(blockStart,faces,faithBlock);
      if (face != null) {
switch (face) {
case NORTH:
          velocity.setX(horPower);
        break;
case SOUTH:
      velocity.setX(-horPower);
    break;
case EAST:
  velocity.setZ(horPower);
break;
case WEST:
velocity.setZ(-horPower);
break;
}
if (blockStart == blockUnder) {
velocity.setX(-velocity.getX());
velocity.setZ(-velocity.getZ());
}
player.setVelocity(velocity);
Util.PlayNote(player,4,5);
}
}
}
Boolean permission=UserManager.teleportPermissionCache.get(player);
if (permission == null) {
permission=Permission.teleport(player);
UserManager.teleportPermissionCache.put(player,permission);
}
if (permission) {
Location out=EntityManager.teleport((Entity)player,locTo,vector);
if (out != null) {
event.setTo(out);
return;
}
}
GelManager.useGel(player,locTo,vector);
}