After this update my box acted same, so itwas going into directly bios instead of opening grub
Even when i tried to live manjaro usb stick and selecting find EFI partions menu couldnt solve
this { when i selected related efi image it was still going into bios/uefi }
I have fixed it with running a manjaro live systen , then run a console terminal and used
sudo manjaro-chroot -a
grub-install /dev/sda
update-grub
exit
and reboot
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