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Well not really spoil as they are dead material but the idea is the same.

Every time you reprocess an asteroid it loses some "freshness" once its reprocessed to many times it just gets destroyed.
Makes little scense that you can keep breaking down and restructuring asteroids without quality or structual loss.

Same idea with prometium chunks, give them a halflife they are exotic material once the material gets collected ( breaking the asteroids might be 2 hard to keep track off ) it will lose quality eventually degrade into a random normal asteroid, maby with a chance of uncommon/rare quality.

The Asteroid Reprocessing recipes only have a ~80% success rate to begin with, so.... feature exists?

Spoiling Promethium is available as a Mod; I like the version that makes them explode.

For completeness, a similar request has been made previously, but just for Prometheum : viewtopic.php?t=119812