Cleanse on malz ult?

I was using Azir ( i won that game) Had a malz mid so i've taken clease for his ult but doensn't work that way. It is a bug or just normal that clease doesn't work on malz ult? If someone of you can try out and give me feedbacks or just explain it to me would be nice! Thanks in advice !{{sticker:slayer-jinx-catface}}
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