Similar problem but still no solution
With a Pocketbook Touch HD3 and calibre 4.22 on macOS I am using the following expression, both for the metadata plugboard and the device interface plugin:
{author_sort}/{series}{series_index:0>2s| - | - }{title} - {author_sort}
The series information is correct for all books which DO belong to a series.
But if a book DOES NOT belong to a series (just a single volume) the series information is badly corrupted as shown with the attached graphics.
So obviously my expression does not really help ...
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