Automatic Maintenance Delayed - Notification Won't Go Away

Since last night, I've had this Automatic Maintenance notification randomly pop up in Action Center which simply refuses to go away:

I've already run the maintenance multiple times, and it seems to complete just fine, but the notification never goes away and it always tells me the maintenance was delayed after it supposedly finished:

I've also gone into Task Scheduler and manually run the Regular Maintenance task per the solution here, but no dice. Also rebooted the system many times.