Standalone Expansion not available in series collection pages
Currently if you look at a series collection page, the main games, dlc and expansions are listed, but not standalone expansions.
https://www.igdb.com/games/nostalgia-forte is not listed on its series collection page https://www.igdb.com/collections/nostalgia
https://www.igdb.com/games/far-cry-3-blood-dragon is not listed on its series collection page https://www.igdb.com/collections/far-cry
I think it is hard to find those stand alone expansions from the perspective of trying to find all standalone games in a series and would really like to have them represented.
I also noticed that. Moreover, the Standalone Expansion does not appear on the Main Game page it belongs to.