Not sure if this is by design:
When Store on Connect > Only if More Recent is checked, and the timestamps on the device aren't newer than in the Calibre database, it won't auto-sync any columns that are currently null values.
For example, if someone already has #lastread and #kobobookmarks columns, and then adds the other two. Any books that hadn't been read since the last time they connected won't sync to the new #percentread column unless doing a manual store.
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