SOLVED:
Just using "use_embedded_content = False" solved the problem that was driving me crazy.
I don't know if this is the "intended" funcionality of Calibre.
It understands that the XML file has "enough" content, but searches the pages of the links, processes them, and then discards them leaving them blank.
After doing that the recipe is straightforward.
I hope this helps anybody.
Best regards.
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