I've made changes to my books based on what I discovered about then while writing my synopsis, and the books were better for it. (kymlucas.me)
But a word of caution: If you make major changes to your book, it might be considered a new edition. (selfpublishingrelief.com)
Any of these sources could be making changes to your book listing, so tracking down the source of incorrect or incomplete data can sometimes be difficult. (selfpublishedauthor.com)