Welcome to android, YMMV !
Can you reproduce if you copy your "Non-fiction" folder into the internal partition?
Sdcard support is there because it seems to work, read only, on most devices. But it isn't granted, as there's no way for users to grant filesystem permissions there.
What *some* devices with sdcard offer is a way to format the sdcard as the internal partition. That's better from KOReader pov, as we can request filesystem permissions there.
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