Nah, the servers are just failing sometimes. I've made comparisons between same threads on both kbin and lemmy instances and almost every time they'd miss some comment (chains) completely and it had nothing to do with defederation or blocking. Syncs just fail or are incomplete, missing up to 40% of comments in some threads. Maybe it's improved now if the traffic stabilized but it seems to me like the foundation is still very unreliable and prone to failures, and the devs didn't implement any backup plans for it (like later reattempts at resyncing or sth).