So, I wanted to see how the jellyfish would look, and found that the situation is even worse than thought. Removing everyone else from view, Shadowheart's shimmer that comes from her temporary hiotpoints remains visible. So that is absolutely a bug that makes photomode difficult to use during a campaign.

NPC's hidden.
[Linked Image from i.imgur.com]

With NPC's shown.

[Linked Image from i.imgur.com]