Cannot Add Preorder Books to Cart

So far, preorder books like the newest one still cannot be added to the cart and checked-out together with other items until the first chapter is out. Is there any chance for this to be fixed?
https://www.fakku.net/forums/books/rokkaku-yasosuke-im-gonna-make-you-melt

Were aware of this issue and a fix is in-progress. As a work-around, if you enable the beta theme by visiting https://www.fakku.net/account/beta you can add the book to your cart via the https://www.fakku.net/books page by clicking the green cart icon, then can proceed to other products and do the same.

Cool! It works even without the beta feature. Thanks!