Failure to boot Manjaro from legacy USB with BTRFS after update mkinitcpio-35.2-2 with manjaro 22.1.0-1

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There’s another report of a user who also boots from exernal USB, keeping the internal drives unchanged:
https://forum.manjaro.org/t/cinnamon-flash-usb-stops-after-grub-after-most-recent-update-today-morning/137458/20