Two feats with the Disharmony trait also specify that your weapon shatters and must be manifested again: Shattering Impact and Twin Guard
For Shattering Impact, it is merely redundant as the Disharmony trait makes you unattuned after the action and all your manifestations vanish while unattuned.
For Twin Guard, it is worse. As a reaction, a balanced solarion could not use Ascended Stability to keep your attunement.  The text says that only one of your weapons shatter, but both would vanish when you become unattuned.