Your Godot version:
3.6
Issue description:
Although the link for the 3.6 ePub zip is able to download (got it here nightly link) and the file is able to open, the 'Contents' section seems to be broken. None of the apps I have tried to use to open it worked correctly. I have also tried to open the 3.6 file with different devices and same problem.
However, the latest documentation ePub file works correctly with 'Contents' working. The issue is only with the 3.6 version.
URL to the documentation page (if already existing):
3.6 documentation