Oh course it's a bug! It's a BEE! *Batum tss* (Sorry, couldn't resist.)
In all seriousness, I do think the thread makes a good point. Some of these effects cost spells or can only be used once per long rest. So disabling them for a picture in photo mode can be annoying. It does feel odd that the option to remove those types of visual effects isn't included. Then again, it's such a massive patch that I feel it's understandable a few things may have been overlooked here and there.
Have you tried saving the game, disabling the active buffs, taking the pictures, and then reloading? I know it's annoying having to do all that, but until an actual fix comes, if it does come at all, there may not be many other options.
Looks like they are going full speed ahead with their next unannounced project, so not sure if they're gonna go back and patch this.
I have thought about this, but I have seen so many pics of post boss fight pics and I would love to do the same, but the thought of having to reload to kill a boss without my buffs just to get the pics sounds like such a pain. So I would love to be able to beat stuff as I normally would and then take my pics with the dead bosses and able to hide my buffs.