Well if you want a credible link
Jordan Maison:
https://www.starwars.com/news/contributor/jmaison
tweeted out that 8 different endings were tested in front of audiences. Not necessarily alternate endings though but more likely different cuts of the same general ending.
https://lrmonline.com/news/star-wars...e-been-tested/
It does seem they may have locked into an official ending now though based on what is out there.