Hi, same issue here with 2600X on MSI X470 Gaming Plus, set on auto, cooled by Noctua U12S. PTC (CPU) 95C and in HWMONITOR goes from 80-115C reading under 'package ( node 0 )' maybe higher.
Please be informed that PTC is the reference temperature point for thermal throttle for the processor. It is not the processor temperature but the temperature limits up to which processor can functionally stable.You need to worry regarding the processor temperature as its absolutely normal. You can simply disregard the readings.