Yes, sorry, that was a misprint. 20.05.2 is OK.
I've installed Armbian_20.05.2_Cubietruck_focal_current_5.4.43 image from scratch to microsd card. It booted fine, I was able to login using ssh. Then if I did 'apt update && apt upgrade'. It installed linux-image-current-sunxi 20.05.3 (and some other 20.05.3 packages) and then device can not boot again with the same symptoms as it was on 20.05.1 images.