This has nothing to do with federation, reddit was a single system and had the exact same issue. It's simply a result of having communities that overlap in topics, or articles that are relevant for multiple communities.

The key is that each of these posts has a different discussion due to the different community it is in, isn't that good?

Yes, that's a solid option, especially since it works fine with another user I created on a different instance. I'll let it go for now and try tomorrow and see. Thanks!

Strange - I created a new user on a different instance (sh.itjust.works) and that's working just fine, meaning it's something related to this specific user 🤔

Nope, Lemmy.ml

Ugh, on Android (Samsung s22) can't even log in... Login form spins a bit but does nothing, user name shows on top left, subscribed communities are fetched but nothing else works (subscribed feed empty, inbox says need to login, etc. ..), restarting resets back to anonymous.

same, sadly unusable at this point

https://github.com/dessalines/jerboa/issues/887 tracking it

Workaround on Jerboa (maybe also other apps, haven't checked) - turn on "hide read posts" and simply upvote/downvote as you scroll. Upvoting/downvoting marks posts as read in Jerboa even if you haven't clicked in, so it's pretty effective.

Make a post at [email protected]

Absolutely, I've done more posting/commenting/upvoting in the last days than I've done on reddit in the last year.