cant do heavy attacks with Exodia Contagion

[A_GreyBear]

so every time i try to do the heavy attack with it it just makes me do a ground pound so i cant do the heavy attack with exodia contagion i can do the light attack just fine but i literally cant do the heavy attacks with it anymore i don't know if warframe just removed it or its just a bug but ether way it is really annoying because zaws are my most used weapon and i only use them because of exodia contagion