Now (I'm not sure whether it's BOOX upgrade or Magisk upgrade that caused it), directly installing Magisk in Magisk Manager won't make Magisk last permanently.
Though the original post says Magisk should be installed to recovery partition as per Magisk installation instruction because "Our device uses 'system as root'", I found that we can actually patch the boot image and make it work. Just patch the boot.img extracted from update.zip, boot from it under fastboot, and it should work. If you want permant installation, flash it to boot partition under bootloader.
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