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Calistn, there are other threads that note there are Problems with books released on or after 22 Apr 2025. I cannot tell enough about your Kindle setup — and wouldn't be the primary resource anyway, as I use K4PC only! — to see if you're running into the same problem(s) as reported on K4PC.
What appears to have happened is that Amazon updated some "feature" parts of Kindle downloads for release on or after 22 Apr, requiring in turn updating K4PC from 2.4 (which works with various other plugins to import Kindle books into Calibre) to 2.7 (which... doesn't; at least not yet). I have been told by People Who Would Know that it wasn't just K4PC, but support software for "most" versions of the Kindle device.
I recommend you ask this question again in the thread for KFX Input under Plugins — you'll get more device-specific answers than I could possibly point at or provide.
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