Hello! I haven't find anything searching, so I'm writing this post.
In short: sometimes Calibre adds the Series metadata to ePub2 files as
Code:
<meta content="Series Title" name="calibre:series"/>
<meta content="1.0" name="calibre:series_index"/>
instead of
Code:
<meta name="calibre:series" content="Series Title"/>
<meta name="calibre:series_index" content="1.0"/>
This makes the Series metadata of the affected books be unable to be read by Pocketbook devices.
As I haven't yet managed to find the trigger, and since apparently this is a very old issue Pocketbook never bothered to deal with, there is a way to force Calibre to write the Nema attribute first and the Content attribute next?
Thanks you for the attention.