When you add a clause link into a section, the platform adds your selected clause link into the contents of the spec, which then becomes available for editing once you save your changes. Previously when you selected the option to discard, the clauses in question still remained in the contents, but unlinked to any sections. Now when you click discard, the platform removes the entries from the contents as well.
In the below screenshot, I have added two composite doorset clauses. You can see that, despite the changes not yet being saved, the two clauses appear within the contents. If I were to now discard my changes, these will be removed.