I'm not sure, but I don't think the legislators should have a lot of sympathy if the defence for wearing a mask is that one doesn't want to appear on camera or be captured by photography. Everywhere a police officer goes nowadays....
I'll give you my own example. Every time I am downtown and step out of a car, I am continuously being filmed by people with cellphone cameras. It's the reality of the way we live. But giving any consideration to a person who is participating in an unlawful assembly with their face covered because they don't want to appear on camera doesn't carry a lot of weight with me.