The Universal photographers specifically tell you that you may remove masks for photos. We posed for a picture on the transport boat and the captain even asked if we wanted one with masks off. They say the same thing for character meet photos - socially distanced of course.
It's pretty easy and understood that you mask up after the photo. So, no reason that Disney couldn't follow suit. It's clear looking at maskless photos that you are socially distanced, so nothing that would look questionable if posted online. Especially considering there are various crowded photos that crop up constantly.