Nap glance showing hundreds of thousands of hours of naps

The nap glance on my Fenix 8 Amoled Sapphire 47mm is currently showing 794,757 hours and 28 minutes of naps split into 3 naps in the detail. It’s not reflected anywhere in Garmin Connect app on iOS so that’s something. Tried to reboot the watch (holding down power button until switch off) but has not helped.