FYI, including "space-exploration-postprocess", instead of "space-exploration" as a dependency seems to work for now, but it's risky long-term. It can lead to circular dependency errors if unrelated mods start changing their dependency lists. Spidertron Tiers ran into this problem this week.
From the Postprocess mod description by Earendel: "If you are a mod maker and want to control the compatibility with your mod do not add this mod as a dependency, add the base Space Exploration mod instead and if changes made here are incompatible they can be removed."