The tiger cloak soldiers (archer or infantry) are not using their melee weapons. They just use their bare fists even their swords are not broken.
After trying to equip myself the sword they have, the problem seems to be that they do use the sword, but the sword is transparent and could not be seen.
Ah, I think that has been pointed out before in previous versions too, not sure if on this exact unit or another. Do you know how to use Morgh's editor? If so you should merely change the weapon these units equip that causes the issue.
Fixed.