Program: 157642
Project: 157642
Buggy source:
@Override public void assignPayment(Game game,Ability ability,ManaPool pool,Cost costToPay){
  if (!pool.isAutoPayment() && pool.getUnlockedManaType() == null) {
    return;
  }
  ManaCosts referenceCosts=null;
  if (pool.isForcedToPay()) {
    referenceCosts=this.copy();
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof ColorlessManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof ColoredManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof HybridManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof MonoHybridManaCost) {
      if (((cost.containsColor(ColoredManaSymbol.W)) && (pool.getWhite() > 0 || pool.ConditionalManaHasManaType(ManaType.WHITE))) || ((cost.containsColor(ColoredManaSymbol.B)) && (pool.getBlack() > 0 || pool.ConditionalManaHasManaType(ManaType.BLACK))) || ((cost.containsColor(ColoredManaSymbol.R)) && (pool.getRed() > 0 || pool.ConditionalManaHasManaType(ManaType.RED)))|| ((cost.containsColor(ColoredManaSymbol.G)) && (pool.getGreen() > 0 || pool.ConditionalManaHasManaType(ManaType.GREEN)))|| ((cost.containsColor(ColoredManaSymbol.U)) && (pool.getBlue() > 0) || pool.ConditionalManaHasManaType(ManaType.BLUE))) {
        cost.assignPayment(game,ability,pool,costToPay);
        if (pool.isEmpty() && pool.getConditionalMana().isEmpty()) {
          return;
        }
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof MonoHybridManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof SnowManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof GenericManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof VariableManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
    }
  }
  pool.lockManaType();
  handleForcedToPayOnlyForCurrentPayment(game,pool,referenceCosts);
}

Fixed version (ground truth):
@Override public void assignPayment(Game game,Ability ability,ManaPool pool,Cost costToPay){
  boolean wasUnlockedManaType=(pool.getUnlockedManaType() != null);
  if (!pool.isAutoPayment() && !wasUnlockedManaType) {
    return;
  }
  ManaCosts referenceCosts=null;
  if (pool.isForcedToPay()) {
    referenceCosts=this.copy();
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof ColorlessManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof ColoredManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof HybridManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof MonoHybridManaCost) {
      if (((cost.containsColor(ColoredManaSymbol.W)) && (pool.getWhite() > 0 || pool.ConditionalManaHasManaType(ManaType.WHITE))) || ((cost.containsColor(ColoredManaSymbol.B)) && (pool.getBlack() > 0 || pool.ConditionalManaHasManaType(ManaType.BLACK))) || ((cost.containsColor(ColoredManaSymbol.R)) && (pool.getRed() > 0 || pool.ConditionalManaHasManaType(ManaType.RED)))|| ((cost.containsColor(ColoredManaSymbol.G)) && (pool.getGreen() > 0 || pool.ConditionalManaHasManaType(ManaType.GREEN)))|| ((cost.containsColor(ColoredManaSymbol.U)) && (pool.getBlue() > 0) || pool.ConditionalManaHasManaType(ManaType.BLUE))) {
        cost.assignPayment(game,ability,pool,costToPay);
        if (pool.isEmpty() && pool.getConditionalMana().isEmpty()) {
          return;
        }
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof MonoHybridManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof SnowManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof GenericManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
      if (pool.isEmpty()) {
        return;
      }
    }
  }
  for (  ManaCost cost : this) {
    if (!cost.isPaid() && cost instanceof VariableManaCost) {
      cost.assignPayment(game,ability,pool,costToPay);
    }
  }
  pool.lockManaType();
  if (!wasUnlockedManaType) {
    handleForcedToPayOnlyForCurrentPayment(game,pool,referenceCosts);
  }
}