Thanks @Kubro for the feedback, Hopefully Asus fixed the ongoing APSM issue.
Please for God's sake Asus put the dates back on the driver download page!? Who's brilliant idea was it to remove the dates on the driver's? When you find out fire them immediately.
after over a month, it seems they finally understood. Its supposed to happen within January:
Hi. I'm with a Prime Z590-A. After the bios update, my PC no longer enters stand-by mode (monitor/system). Can this be related?
Did you update your Intel MEI/ME firmware before flashing bios? Also, it is a good idea to clear CMOS or load-optimized defaults, because sometimes settings bug out for some reason.