Dragonflight old craft item

Hi last day a guild mate ask me to craft some plate from dragonflight for trasmog
but i cant anymore because we can get any spark for dragonflight .
how can fix that or blizz need to do ?

If you have a level 70 alt who has never done the quest chain, you get 5 sparks on that. Use those to craft and you unlock the transmog on your warband. Not a very good solution, but it works.