I am now currently running Armbian 23.03 and have turned on 3D acceleration by running the scripts. This version is very stable as the versions were previously. The screen still does not blank despite the screen setting.
BTW, I tried the latest ubuntu image (Orangepi5_114 jammy desktop gnome). This is also very stable. However, the screen blanking is the same as the current version of Armbian. No blanking despite the screen setting.