Weird thing on the Meta, the “Hidden Whispers” theme only appears when the current theme is “Central”, “Default (full-width)”, “Fully”, “Meta Branded”, or “redditish”. Example:
Default:
redditish:
Not sure if it’s relevant, but I noticed while writing this that the themes where “Hidden Whispers” shows up are also the ones where the reply box covers up the theme toggle.
Hidden Whispers also doesn’t have a description in the theme category that I can find. This appears to be the only other mention of its existence? I feel like I’m losing my mind 
edit: This might not be related to this theme-commponent, I see the same behavior in the profile > interface > theme menu.