FIXED:
Fan not working: I found that when I used my laptop charger to power the device the fan started to work normally. I see the fan spinning up when I get the thermal trigger.
This issue is happening with my unit too,
the fan’s power is wired to the 5V GPIO on the board.
Measuring the 5V GPIO while the fan is supposed to be spinning reads only 3.5V.
I’ve also fixed the issue by using a different charger