That's a strange bug. I just restarted my phone to see what would happen and all battery stats were still displaying normally, including my SOT since last full charge.
Does a soft reset work on a Pixel to reset battery stats? On Moto phones when there were battery display issues we always recommend to reset battery stats by holding the power button until the phone reboots itself > then plug into the OEM charger and leave it alone until it reaches 100% and then for 30 minutes after 100%.....so typically something you would do right before going to bed and leave it charge for hours while you sleep. That would reset the battery stats so they hopefully display normal data after that.