Indeed, and I was talking about the boot image, but some still refer to it as the recovery, i.e. LineageOS. I see LOS have changed their download pages now and correctly call the boot image boot.img instead, that's good. So anyway, just download the boot image alongside the ROM instead of extracting it, and rerun Magisk install before rebooting after an OTA, and it's all very doable. Not as easy as before, but not too hard either.