[Dr. J Chakma]

I think by “functional citta”, you wanted to mean neutral citta. In case of neutral citta, i.e. neither kusala nor akusala, such as doing dishes, only 7 universal cetasika arise. No asobhana, no sobhana, or pakinnaka (particulars citta that can be there in kusala or akusala citta/thought) citta arise in neutral thought/citta. A neutral citta do not produce kamma beeja. Whatever rupa that is produced by neutral citta are duds and do not have any energy/potential in them, unlike kamma beeja, that have potential or energy embedded in them, which can change over time.
This is my understanding, if I am wrong, please someone point out the mistakes.
Metta to all