Data point:
On December 11, 2023, I bought a main cabin refundable flight with no initial seat selection for $788.00. The transaction description is "HAWAIIAN AIRLINES HOHONOLULU" along with itinerary airports.
In separate transactions, I bought seats for each flight for $88.00 and $95.00. The transaction description is again "HAWAIIAN AIRLINES HOHONOLULU" but the additional details are "Misc. Charge Order (Mco)/Prepaid Ticket Auth."

I received automatic reimbursement on December 20, 2023 for each seat transaction:
-$88.00
-$97.00