Granted, the warning says clearly “If you deselect Undetermined, you will not see most content”, which places the onus on the individual user, as apposed to logic built into Lemmy on which posts/comments can be viewed, while also leaving it to each user to have to weed out alternate languages for their views which are incorrectly set. This is indeed leading to many posts simply not appearing (as designed and intended), which is less than ideal when trying to grow a user base/community.
That’s exactly what I see, but when I click save to apply the change, there is no evidence that the changes have successfully been applied. The list looks exactly the same as it did before one has selected anything at all. It’s a bit of a leap of faith, no?