Yes, this is normal. It's been this way since Ryzen came out. Ryzen CPU's report their temperature as the hottest thing in the processor, and when there's something to do, Windows will shove it onto one or two cores typically. Those cores will then jump to a really high boost speed, which greatly increases the temperature for that core.
If there's nothing else going on, it'll drop back down to idle until there's housekeeping tasks to do, in which case, you'll see periodic temperature spikes. If you're gaming, it'll level out eventually once more cores are being used.