They do Pro Forma sessions to get around recess appointments, anyways.
Taking a look at all the players going positive now, there won't be any interruptions during the run up to election day. If there are late deciders who won't vote for Biden that would be important. I think there will be a lot of late deciders.
IOW, could this be a "strategic" quarantine period to thwart a positive right before the election. Drop the hammer when the quarantine ends and keep the pressure on unencumbered until election day.