Big Sur Bootdisk not visible in clover boot screen

Tried Big Sur direct upgrade from Catalina and direct USB install. Installation goes thru. But, after reboot no MacOS Boot disk, only " boot install....via preboot. If click on this (boot install....via preboot", clover shows apple logo for a one-two seconds, then reboots.

When booted thru a Clone (Catalina), I see that the Big Sur is installed on the original SSD.

Hardware: MB Gigabyte z390 Aorus pro wifi; I7-9700 K CPU; Sapphire nitro RX 580 GPU; Samsung 907 EVO m2. ssd.

Author: spsharma