A lot of people miss that third deduction
“A is neither B nor C” alone doesn’t imply that B isn’t C. Inequality is NOT transitive.
I guess in other games you can make that deduction from the context, but in this game, the player generally isn’t told how the clue suggests that “A is neither B nor C”.
In my example, “I found curious details in a painting that suggests that whoever was desperate to hide a murder was neither Mrs. Salome Vile nor the person who had the scalpel.” doesn’t make clear that the painting presents these as three different people. Instead it’s just another randomly generated clue where I’m given the detectives conclusion, but not the details of how this conclusion was made.
You need to either explicitly tell the player the full conclusion, namely “A, B and C are three different people”, or make the context more explicit.