I’ve just run into the same issue myself. Or rather, I’ve run into it a few times. Normally a reboot will fix it, or just simply waiting. This time however it persisted through reboots even after the system had cooled down to ambient temperature.
Unfortunately I don’t have my framework screwdriver handy, nor a thumbdrive or other boot device so trying to do a CMOS reset or checking for a BIOS update wasn’t an option (I’m on Linux and the latest seems to not be available via fwupd). Resetting the BIOS did not work.
However, I was able to resolve it by disabling quick/quiet boot and started getting normal performance again and the processor is at a more appropriate frequency, bouncing around between 1 -2 ghz.