Auction house - Rarity sorter does not work

The enderpearl "Rarity Sorter" gives options for Common, Uncommon, Rare, Epic, and Legendary tier items, but I tested with a Blue Crystal Pick and it shows a blank page when filtering for "rare" items. The auction house needs to be a lot more active for this to be "useful" so if this isn't easy to fix may or may not be best to remove this feature