Program: 174588
Project: 174588
Buggy source:
@SubscribeEvent public static void registerItemBlocks(RegistryEvent.Register<Item> event){
  event.getRegistry().register(new ItemBlock(DUNGEON_BRICK).setRegistryName(DUNGEON_BRICK.getRegistryName()));
  event.getRegistry().register(new ItemBlock(BOSS_DOOR).setRegistryName(BOSS_DOOR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(COMMON_LOOT_CHEST).setRegistryName(COMMON_LOOT_CHEST.getRegistryName()));
  event.getRegistry().register(new ItemBlock(UNCOMMON_LOOT_CHEST).setRegistryName(UNCOMMON_LOOT_CHEST.getRegistryName()));
  event.getRegistry().register(new ItemBlock(RARE_LOOT_CHEST).setRegistryName(RARE_LOOT_CHEST.getRegistryName()));
  event.getRegistry().register(new ItemBlock(EPIC_LOOT_CHEST).setRegistryName(EPIC_LOOT_CHEST.getRegistryName()));
  event.getRegistry().register(new ItemBlock(LEGENDARY_LOOT_CHEST).setRegistryName(LEGENDARY_LOOT_CHEST.getRegistryName()));
  event.getRegistry().register(new ItemBlock(COMMON_JAR).setRegistryName(COMMON_JAR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(UNCOMMON_JAR).setRegistryName(UNCOMMON_JAR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(RARE_JAR).setRegistryName(RARE_JAR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(EPIC_JAR).setRegistryName(EPIC_JAR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(LEGENDARY_JAR).setRegistryName(LEGENDARY_JAR.getRegistryName()));
  event.getRegistry().register(new ItemBlock(COMMON_BARREL).setRegistryName(COMMON_BARREL.getRegistryName()));
  event.getRegistry().register(new ItemBlock(UNCOMMON_BARREL).setRegistryName(UNCOMMON_BARREL.getRegistryName()));
  event.getRegistry().register(new ItemBlock(RARE_BARREL).setRegistryName(RARE_BARREL.getRegistryName()));
  event.getRegistry().register(new ItemBlock(EPIC_BARREL).setRegistryName(EPIC_BARREL.getRegistryName()));
  event.getRegistry().register(new ItemBlock(LEGENDARY_BARREL).setRegistryName(LEGENDARY_BARREL.getRegistryName()));
  event.getRegistry().register(new ItemBlock(COMMON_CRATE).setRegistryName(COMMON_CRATE.getRegistryName()));
  event.getRegistry().register(new ItemBlock(UNCOMMON_CRATE).setRegistryName(UNCOMMON_CRATE.getRegistryName()));
  event.getRegistry().register(new ItemBlock(RARE_CRATE).setRegistryName(RARE_CRATE.getRegistryName()));
  event.getRegistry().register(new ItemBlock(EPIC_CRATE).setRegistryName(EPIC_CRATE.getRegistryName()));
  event.getRegistry().register(new ItemBlock(LEGENDARY_CRATE).setRegistryName(LEGENDARY_CRATE.getRegistryName()));
}

Fixed version (ground truth):
@SubscribeEvent public static void registerItemBlocks(RegistryEvent.Register<Item> event){
  event.getRegistry().register(new ItemBlock(DUNGEON_BRICK).setRegistryName(DUNGEON_BRICK.getRegistryName()));
  event.getRegistry().register(new ItemBlock(BOSS_DOOR).setRegistryName(BOSS_DOOR.getRegistryName()));
  if ((boolean)Launch.blackboard.get("String_Node_Str")) {
    event.getRegistry().register(new ItemBlock(COMMON_LOOT_CHEST).setRegistryName(COMMON_LOOT_CHEST.getRegistryName()));
    event.getRegistry().register(new ItemBlock(UNCOMMON_LOOT_CHEST).setRegistryName(UNCOMMON_LOOT_CHEST.getRegistryName()));
    event.getRegistry().register(new ItemBlock(RARE_LOOT_CHEST).setRegistryName(RARE_LOOT_CHEST.getRegistryName()));
    event.getRegistry().register(new ItemBlock(EPIC_LOOT_CHEST).setRegistryName(EPIC_LOOT_CHEST.getRegistryName()));
    event.getRegistry().register(new ItemBlock(LEGENDARY_LOOT_CHEST).setRegistryName(LEGENDARY_LOOT_CHEST.getRegistryName()));
    event.getRegistry().register(new ItemBlock(COMMON_JAR).setRegistryName(COMMON_JAR.getRegistryName()));
    event.getRegistry().register(new ItemBlock(UNCOMMON_JAR).setRegistryName(UNCOMMON_JAR.getRegistryName()));
    event.getRegistry().register(new ItemBlock(RARE_JAR).setRegistryName(RARE_JAR.getRegistryName()));
    event.getRegistry().register(new ItemBlock(EPIC_JAR).setRegistryName(EPIC_JAR.getRegistryName()));
    event.getRegistry().register(new ItemBlock(LEGENDARY_JAR).setRegistryName(LEGENDARY_JAR.getRegistryName()));
    event.getRegistry().register(new ItemBlock(COMMON_BARREL).setRegistryName(COMMON_BARREL.getRegistryName()));
    event.getRegistry().register(new ItemBlock(UNCOMMON_BARREL).setRegistryName(UNCOMMON_BARREL.getRegistryName()));
    event.getRegistry().register(new ItemBlock(RARE_BARREL).setRegistryName(RARE_BARREL.getRegistryName()));
    event.getRegistry().register(new ItemBlock(EPIC_BARREL).setRegistryName(EPIC_BARREL.getRegistryName()));
    event.getRegistry().register(new ItemBlock(LEGENDARY_BARREL).setRegistryName(LEGENDARY_BARREL.getRegistryName()));
    event.getRegistry().register(new ItemBlock(COMMON_CRATE).setRegistryName(COMMON_CRATE.getRegistryName()));
    event.getRegistry().register(new ItemBlock(UNCOMMON_CRATE).setRegistryName(UNCOMMON_CRATE.getRegistryName()));
    event.getRegistry().register(new ItemBlock(RARE_CRATE).setRegistryName(RARE_CRATE.getRegistryName()));
    event.getRegistry().register(new ItemBlock(EPIC_CRATE).setRegistryName(EPIC_CRATE.getRegistryName()));
    event.getRegistry().register(new ItemBlock(LEGENDARY_CRATE).setRegistryName(LEGENDARY_CRATE.getRegistryName()));
  }
}