It also could be from an auxiliary signal typically used for remote broadcasts ("IFB"). They often are in the VHF or UHF frequency bands easily picked up by scanners. With folks working from home, it could be set up for their morning show folk(s) to get queues from the station so they can smoothly go to commercial or hear others that are on the air with them that are also working from home. This is important to eliminate the delays from internet based feeds, stations that also have "HD Audio" signals, and other things that may cause a delay in the audio signal.
It could also be the feed from the host working from home back to the station. What frequency does your scanner's Close Call report the signal is on? That may help to identify what the cause is.