Cam F

Okay, so I've done a little bit of testing to try and figure out the cause of the issue here are some more notes. Previews directly from the Kobo store...

Table of contents are identical between the two books. [This reddit thread](https://old.reddit.com/r/kobo/comments/uy9n54/cant_bookmark_sideloaded_kepubs/) appears to have the same issue I'm encountering except they're using KCC to convert directly to kepubs instead...

All functions operate as expected under firmware 4.31.19086. The issue appears in any firmware versions following that. I'll submit a bug report officially to Kobo at a later date, but...