The settings page says "Warning: If you deselect Undetermined, you will not see most content.", however there is no option for this. I can't comment on other communities, is this related?
I'm noticing that when I view some communities in other instances from within the feddit.uk instance, it says there is 0 comments on every post, or I can't see posts at all. When I view them from an account I made on lemmy.world, I can see everything. I can only assume that this is related to the 'Undetermined' language option. Tom is this something you can look into please? Under Settings there is a Languages box (different to interface language), but we can only select English rather than 'Undetermined'.
If you Ctrl+ Click English and Unspecified, it will select both. I've personally just clicked on the languages box, pressed Ctrl + A to select them all, so I can see posts in all languages.
I had an issue at first where I accidentally selected only Undetermined and some Cyrillic language, so when I posted from jerboa (which I guess automatically selects the language if you have more than Unspecified set), it was marked as that language.