In the AMD Settings program => Games => Global Configuration=> Wattman Global=> In the seccion on temp and rpm of fan, click option Zero RPM (DISABLED). And then , click up applied. You can save perfil.
Is a fail of design, you can install CPUID HWMonitor for control the temps,
I personally put manually 1600RPM when im crunching, in my RX570, and have temps in 64-70ºC
But is very dangerous if you no have experience get avaliable manually.
Although the designers have a salary of 6000 euros per month, they dont know design.