code: protected static function getCachedIblockPropertiesData()
      {
          $iblockId = static::iblockId();
          if (!empty(self::$iblockPropertiesData[$iblockId])) {
              return self::$iblockPropertiesData[$iblockId];
          }
  
          $props = [];
          $dbRes = CIBlock::GetProperties($iblockId, [], []);
          while($property = $dbRes->Fetch()) {
              $props[$property['CODE']] = $property;
          }
  
          return self::$iblockPropertiesData[$iblockId] = $props;
      }
docs: Fetches static::$iblockPropertiesData if it's not fetched and returns it.
  
  @return array