I was putting together Fate of the Elder Gods for a private game session and struggled with the game mechanic of readying spells. Each spell has a cost shown on the face-up side of the card and the player would cover the bottom (spell) portion with their hand to reveal the cost to everyone else (to ensure it is properly paid). I could not find a way to get the hidden zone to allow for parts of the card to show through; as soon as a voxel of the card enters the hidden zone, the entire card become hidden.
This suggestion/request is to have a setting on hidden zones that hide only what is within the boundary, thus allowing the reveal of parts of objects and cards.