In fact, worddumb does not change cde_content_type from PDOC to EBOK for the KFX file that is delivered by Amazon.
However, if I generate KFX with the KFX output plug-in, worddumb works well.
I guess the KFX format delivered by Amazon is different from that from the KFX output plugin.
The details are as follows:
Features: CanonicalFormat-2, kfxgen.pidMapWithOffset-1, kfxgen.positionMaps-2, kfxgen.textBlock-1, max_id-827, reflow-section-size-3, reflow-style-6, yj_jpegxr_sd-1
Metadata: ASIN=BBISHGDH1Q, asset_id=CR!K48T9JK9VD1FS2QT71CHAV8VWRN1, author="Tolkien, J. R. R.", book_id=ngvnx1GISRCkatp4-O8R2g0, cde_content_type=PDOC, content_id=BBISHGDH1Q, cover_image=866x1315, creator_version=2.15.0, description=..., file_creator=YJConversionTools, is_sample=False, issue_date=2023-10-11, kfxgen=20.12.238.0, language=en, nested_span=enabled, publisher=, reading_orders=1, selection=enabled, title="The Fellowship of the Rings"
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