This is on a Kobo Libra H2O. The books were transfered via the WiFi client, and then via USB cable when that did not work.
In case it is relevant: When connecting via WiFi, Calibre reports a subset of books as in-memory on device. When connecting via USB, Calibre reports a different subset of books as in-memory. In reality, there is only one directory with books on device.
The host is running Calibre 6.8 on macOS 12.6.
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