We can't burn Warlock spell slots to create Sorcery points if we still have Sorcerer spell slots avaiable and we can't choose to spend the Warlock spell slots to cast some spells if we still have the sorcerer spell slots avaiable, the game always utilize sorcerer spell slots first. This really ruins the multiclass between these two because you can't really refil the sorcery points burning warlock spell slots and short resting to refil it again. I don't know if it's intended.
