Chapters are off by 1 Page if "De-dupe cover" is enabled

[bust4cap]

Describe the bug
When De-dupe cover is enabled and a cbz with chapter info is being converted, the resulting epub has wrong chapter information. For example if page 6 is supposed to have a chapter, in the converted epub its page 7 instead, and therefore starts one page late.

To Reproduce

1. add a cbz with chapters inside a comicinfo.xml file
2. enable De-dupe cover
3. set output to EPUB
4. click convert

Expected behavior
I expected the chapters to be on the correct page, not one page late :P

Screenshots

Desktop (please complete the following information):

• OS: Windows 11
• Device: not applicable

Additional context
This also causes a "list index out of range" error when a chapter is the very last page