I have an epub that I created in Sigil and I am converting it to azw3. When I do this, the css for the hard coded table of contents gets changed so that what should be indented subheadings becomes a "flat" list.
In this folder I have placed the original epub, the converted azw3, the conversion log, a screen shot of the output options, text files of just the html table of contents for the epub and azw3:
https://www.dropbox.com/sh/dnprfnbvf...dAu3hAeCa?dl=0
I have also included screen shots of the table of contents from each version.
Note, I originally used the css Sigil created for the toc, but the converted to azw3 results were the same. So then I added the indents as hard coded styles in each paragraph. That I what I have given here.
Thanks for reading, and please let me know if you need any other information.