bug is line 542 in plugin.py, "navlable" should have been "navlabel" to given an initial value of None. An updated value is generated from parsing the ncx but in your case there was no navlabel text and so no new value assigned.
Rebuilding the ncx "fixed" it by creating a navlabel which was then properly handled. I will fix this typo.
Thanks for the bug report.
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