Favorites are ordered by post date
Favorites from /api/v1/favourites are ordered by favorite date but then re-ordered by post date in the front-end which may cause trouble when scrolling down.
Favorites from /api/v1/pleroma/accounts/:id/favourites are already ordered by post date.
However, both endpoints should be ordering by favorite date and the frontend should NOT be re-ordering the results.
You want to see the most recently favorited posts on top. (Don't you?)