Nurri protein shake steaming after opening?

This is the second time I've bought a pack of Nurri protein shakes from Costco and it's happened both times. Every time I open a can, a little wisp of steam curls out of the opening. I think it's steam. Seems too gas-like to be powder. I didn't think anything of it until today. Google says steam is always a bad thing, but is it possible it's just a natural reaction of being in a can instead of a bottle?

They smell and taste great, not texture issues, and have never made me or my kids sick.