Program: 164215
Project: 164215
Buggy source:
public void item(Item item){
  if (item == null) {
    active=false;
    topLeft.visible=topRight.visible=bottomRight.visible=false;
    icon.visible(false);
  }
 else {
    active=true;
    topLeft.visible=topRight.visible=bottomRight.visible=true;
    icon.visible(true);
    icon.view(item);
    topLeft.text(item.status());
    boolean isArmor=item instanceof Armor;
    boolean isWeapon=item instanceof Weapon;
    if (isArmor || isWeapon) {
      if (item.levelKnown || (isWeapon && !(item instanceof MeleeWeapon))) {
        int str=isArmor ? ((Armor)item).STR : ((Weapon)item).STR;
        topRight.text(Utils.format(TXT_STRENGTH,str));
        if (str > Dungeon.hero.STR()) {
          topRight.hardlight(DEGRADED);
        }
 else {
          topRight.resetColor();
        }
      }
 else {
        topRight.text(Utils.format(TXT_TYPICAL_STR,isArmor ? ((Armor)item).typicalSTR() : ((MeleeWeapon)item).typicalSTR()));
        topRight.hardlight(WARNING);
      }
      topRight.measure();
    }
 else     if (item instanceof Key && !(item instanceof SkeletonKey)) {
      topRight.text(Utils.format(TXT_KEY_DEPTH,((Key)item).depth));
      topRight.measure();
    }
 else {
      topRight.text(null);
    }
    int level=item.visiblyUpgraded();
    if (level != 0) {
      bottomRight.text(item.levelKnown ? Utils.format(TXT_LEVEL,level) : TXT_CURSED);
      bottomRight.measure();
      bottomRight.hardlight(level > 0 ? UPGRADED : DEGRADED);
    }
 else     if (item instanceof Scroll || item instanceof Potion) {
      bottomRight.text(null);
      Integer iconInt;
      if (item instanceof Scroll) {
        iconInt=((Scroll)item).initials();
      }
 else {
        iconInt=((Potion)item).initials();
      }
      if (iconInt != null) {
        bottomRightIcon=new Image(Assets.CONS_ICONS);
        int left=iconInt * 7;
        int top=item instanceof Potion ? 0 : 8;
        bottomRightIcon.frame(left,top,7,8);
        add(bottomRightIcon);
      }
    }
 else {
      bottomRight.text(null);
    }
    layout();
  }
}

Fixed version (ground truth):
public void item(Item item){
  if (item == null) {
    active=false;
    topLeft.visible=topRight.visible=bottomRight.visible=false;
    icon.visible(false);
  }
 else {
    active=true;
    topLeft.visible=topRight.visible=bottomRight.visible=true;
    icon.visible(true);
    icon.view(item);
    topLeft.text(item.status());
    boolean isArmor=item instanceof Armor;
    boolean isWeapon=item instanceof Weapon;
    if (isArmor || isWeapon) {
      if (item.levelKnown || (isWeapon && !(item instanceof MeleeWeapon))) {
        int str=isArmor ? ((Armor)item).STR : ((Weapon)item).STR;
        topRight.text(Utils.format(TXT_STRENGTH,str));
        if (str > Dungeon.hero.STR()) {
          topRight.hardlight(DEGRADED);
        }
 else {
          topRight.resetColor();
        }
      }
 else {
        topRight.text(Utils.format(TXT_TYPICAL_STR,isArmor ? ((Armor)item).typicalSTR() : ((MeleeWeapon)item).typicalSTR()));
        topRight.hardlight(WARNING);
      }
      topRight.measure();
    }
 else     if (item instanceof Key && !(item instanceof SkeletonKey)) {
      topRight.text(Utils.format(TXT_KEY_DEPTH,((Key)item).depth));
      topRight.measure();
    }
 else {
      topRight.text(null);
    }
    int level=item.visiblyUpgraded();
    if (level != 0) {
      bottomRight.text(item.levelKnown ? Utils.format(TXT_LEVEL,level) : TXT_CURSED);
      bottomRight.measure();
      bottomRight.hardlight(level > 0 ? UPGRADED : DEGRADED);
    }
 else     if (item instanceof Scroll || item instanceof Potion) {
      bottomRight.text(null);
      Integer iconInt;
      if (item instanceof Scroll) {
        iconInt=((Scroll)item).initials();
      }
 else {
        iconInt=((Potion)item).initials();
      }
      if (iconInt != null && iconVisible) {
        bottomRightIcon=new Image(Assets.CONS_ICONS);
        int left=iconInt * 7;
        int top=item instanceof Potion ? 0 : 8;
        bottomRightIcon.frame(left,top,7,8);
        add(bottomRightIcon);
      }
    }
 else {
      bottomRight.text(null);
    }
    layout();
  }
}