Had this happen to me.
If it was requested, the swu request would have dropped at around 24 hours. But the comp would have stayed/taken over/auto requests — whatever. . What needed to happen here was at checkin u would have needed to ask to use the swu for the domestic leg and have it put into the airport system as a swu and get the higher priority.
Agent explaine this to me at checkin and a few keystrokes later I was #1 and easily cleared with my swu.