System boots and works perfectly until "Enable nested VT-X/AMD-V' option in VirtualBox is enabled (first screenshot).
If the above mentioned option is enabled then system does not boot being stuck on loading (second screenshot)
Windows 11 (21H2) 64-bit
AMD Ryzen 3600
AMD B550 Chipset (Hardware virtualization enabled in UEFI/BIOS)
macOS Catalina 10.15 installed using your script (with some tweaks for AMD CPU from this article). Latest Safari version and security patch installed through macOS update system.
System boots and works perfectly until "Enable nested VT-X/AMD-V' option in VirtualBox is enabled (first screenshot). If the above mentioned option is enabled then system does not boot being stuck on loading (second screenshot)