I recently encountered this problem and that led me to this thread. I was trying to convert a book from epub to azw3 and it kept crashing the kindle on download. Removing the svg files solved the problem.
I opened the epub using 7zip (on Windows) and deleted the svg files. I then converted this revised epub to azw3, which loaded with no issues. (I copied the epub first and worked on the copy, maintaining an intact epub for backup.)
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