Not just a display issue - jumping straight to 0% indicated SOC probably is a result of the BMS detecting one cell reaching a lower cutoff voltage.
On the ride to work, where the bike indicated 0% SOC, the BMS didn't actually kill power .. so it may have detected a lower voltage below 0% but not quite to the point where the BMS killed power to the bike (to prevent further discharge and permanent damage). On the ride back, it actually did kill power to the motor.
Could be a faulty cell, or could be a faulty sensor. Could also be really bad calibration if the bike has been sitting for a long period of time.
After killing power and power cycling the bike .. the dashboard showed the expected SOC. That probably indicates it's not actually a problem with a cell, but a faulty sensor.
If it was my bike, I'd probably cycle the battery a few times by riding it on some safer routes - down to 20-30% - and charging back to full and see if the problem goes away.
Since it's a dealer bike, I'd let them deal with it. I'm curious whether the bike was ridden on a semi-regular basis, or if it had been sitting for weeks or more.