Does Cassiopea's Miasma proc Banshee's Veil Passive?

I was playing an Aram earlier this day. Got my self a Janna, and bought Banshee's Veil as a second item. So, Every time i Stepped on to Cassiopea's Miasma, Banshee's Veils Passive Wouldn't go off. Is it supposed being this way? {{item:3009}} {{item:3009}} {{item:1001}}
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