epubx : .CoverImage doesn't seem to work

[sidetraxaudio]

Describe the bug
As reported in the original pre-fork version, After EpubReader.readBook loads an epub, most epubs fail to return anything from (loadedBook).CoverImage

To Reproduce
loadedBook = (await rootBundle.load(bookPath)).buffer.asUint8List();
works fine
currentBook = EpubReader.readBook(loadedBook);
works fine
bookCoverImage= currentBook.CoverImage;
Always seems to return null

Expected behaviour
A returned image object containing data

Additional context
See Issues section of original package that this is a fork of.

[RomanSoviak]

Have the same issue

[AsimBhadra]

Same issue