See https://forum.manjaro.org/t/oracle-vm-stuck-at-20/127927/8
You must add ibt=off
to the end of line shown below:
menuentry 'Manjaro Linux (/dev/nvme0n1p5, kernel 6.2.0rc8-1-MANJARO x64, nouveau)' --class manjaro --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-c13a7c80-7780-4e43-90c1-c7cc4b4d36c2' {
savedefault
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root c13a7c80-7780-4e43-90c1-c7cc4b4d36c2
linux /boot/vmlinuz-6.2-x86_64 root=UUID=c13a7c80-7780-4e43-90c1-c7cc4b4d36c2 rw quiet udev.log_priority=3 ibt=off
initrd /boot/intel-ucode.img /boot/initramfs-6.2-x86_64.img
}