Currently, any internal link inside of a book in PDF generated by Collection will point to the source wiki. Instead, they should point to the PDF itself, if the target page is also part of the same collection (which is very common in case of Wikibooks, where a chapter often links to another chapter, and all chapters of a book are in the same collection).
Version: unspecified
Severity: minor
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=60294