temps spike

Have a recently purchased 12400f CPU using the Intel stock cooler. I replaced the stock thermal paste with DeepCool Z5 and while the idle temps have improved and are now at 46-47, under load (playing Witcher 3 maxed out at 1080p) it still gets up to 99. It doesn't consistently hold 99 but...

My CPU temps welling loading into certain games or playing them spike up to 90-99˚c but immediately go back down to normal gaming temps around 40-55˚f. Room temp changes but even on a cold day it will spike high. Is this normal or cause for concern? Parts list: i5-13600k Deepcool AK620 MSI...