I have a different model of Framework 13, the 12th-gen Intel version. I just updated the firmware to 3.17, and am now seeing that the fan speed randomly spikes up to the fastest speeds for about a half-second every now and then, which seems to me to be very similar to what people are complaining about in this thread. In my case, I see a correlation with spurious, incorrect readings from ACPI temperature sensor 1, which last for the same amount of time as the burst in fan speed.
I don’t mean to derail the thread, and I posted about my issue elsewhere. I’m mentioning it here just to let you all know that the issue may not be specific to your particular model of Framework 13.