Do votes and comments not always federate with other instances? When I view the same post in different instances i.e. this instance and lemmy.world, they number of votes and comments are different. Is this because of some instances we are blocking?
Example:
Some of those interactions will simply need time to propagate. However, there's a number of things going on here. Aside from the fact that the federation process itself probably needs some tuning/optimization for the current number of users, before 0.18 one of the goto workarounds for hot/active being broken were regular restarts. Everytime they restarted anything in the outbound queue was lost. I believe they would still show locally though. All that said I think this is primarily a case of slow propogation. Particularly because of the migration wave.