Same issue here with two different chargers on two different usb C ports.
Charging the whole time
BD PROCHOT on throttlestop.
Temps in the 40s-50s
Webbrowsing in chrome
BIOS updated to latest.
Room temp 72F
Never has happened on battery.
Log attached. Started log with it at 400mhz. Detached power and reattached at some point which solved the issue for a minute, then it came back.