I think it happens because it creates a different url for the comic directory 

Hello! I am experiencing this weird bug, if I add a single directory to my library, then I get this very cool read/bookmark button under each issue 

However, if I add directories to the library separately the button disappears 

It's not big deal as I guess I could merge both my libraries into the same directory, (I have one for comic and other for manga) but I was wondering if there is a setting or config I'm overlooking to fix this problem? thank you!