Printable diffs now contain a hideous combination of the old and new diff styles.
Additionally, while it might not be classified as a bug, the new styling for diffs is just awful. The old style may not have had all those rounded corners the kids like these days, but they were compact and readable. The new style is an unreadable eyesore, which I'd describe as style over substance if it had any style to it.
An acceptable fix for this bug would be simply to revert all those changes.