I have:
- a healthy epub3
- mangled by means of Sigil (0.9.3)
- ... with added semantics, notably "text"
- convert to mobi with Kindle Previewer
Aaaaand Go To > Beginning doesn't, as I would expect, steer the device to the XHTML page marked "text", but rather one preceding it (note that each chapter/section is a separate XHTML file).
?