Ayyubid desert raiders bug (no bonus damage vs light melee in ranged mode)

desert raider description says they are effective against light melee in ranged mode, but there is no bonus damage vs light melee in ranged mode, it just an expensive unit that deals 7 damage on base dmg only
image

image

is this intentional? or a bug?
because so far they are only good to serve as early anti cav