Favorites -page has now"fresh content" on dropdown (fast fix). But you need to change to something else first, then back to "fresh content" and it sorts by post-date.
It still breaks up on Galleries-page and it needs to be fixed there (that was a reason why it was removed). :-/
I'll have more look now, I've on summer holiday from my daily job. Meaning it will fixed in the next week or two.
Result for me: It sorts by first post.
But I greaty appreciate your efforts. Have a nice vacation.