This is a known federation issue being fixed in the next update
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I see a new version at lemmy.ml. will we be upgrading? It seems it is not an official release, but this current release seems in such bad shape that can't imagine an RC been much worse.
The more I check the more I am noticing lots, not few, of messages missing across many communities. Happy to point out specifics if it would help, but it seems fairly widespread. This totally defeats the purpose of having an account at a smaller instance if we can't view so many posts that we have to constantly read at he source and then can't vote / comment.
Once I feel happy with upgrading I will. There are still many bugs evident in the RCs. If you are unhappy with your account here you can make one on a bigger server. Thats the beauty of decentralization. In regards to federation issues we are early adopters, lemmy is very new to this scale and volume of users and posts. Patience is always welcome.