Rock 4C+ : Cooling fan stops rotating after booting with Debian 11 ( LInux 5.10)

I have recently tested Debian 11 (Linux 5.10) from Rock4/downloads - Radxa Wiki on Rock 4C+ and found that the cooling fan stops rotating after the OS boots, whereas it works perfectly fine with older images.

Is there some configuration that has to be done to make the cooling fan work properly?