" Bench with "Remove a random modifier, replacing it with a veiled modifier instead."
Note: Only non-signature veiled modifiers can be added this way. The bench will respect meta-crafting modifiers.
This is not a bug. The entire point of Soul's Wick is to prevent bringing specific spectres with you and use what corpses you find in the area as temporary minions, while providing a generically useful power boost to reduce the power gap between that playstyle and the regular ability to have specific types of spectre all the time and optimise around them.