When I click 'play' on the Minecraft Launcher and the red Mojang screen pops up, my CPU temperature skyrockets from 50°C to ~97°C (checked with NZXTcam) for a dozen or so seconds until the title screen starts where it sits at ~60°C. I have no temperature problems in the actual game of Minecraft or in other AAA games such as Sekiro or The Witcher 3 where the temperature is ~80°C on very high settings. To give more information, I have an i7-9750h with 16gb RAM and the temperature only ever reaches this kind of temperature during the startup.

8 months later: No replies, no support, no comments, and the problem still exists. Here's a toast to hoping that someone will read this within the next year.