Yes, there is lag in the sync times

Pretty much the same for me. When looking at the 33K milestone post on lemmy.world directly on lemmy.world, I see 106 comments. When viewing it from lemm.ee I see 79, from Feddit it's 76.
What's funny is that from Kbin, the only site that actually shows a warning that the content may be incomplete, I can see 100 comments so from all sites that are not lemmy.world, Kbin shows the most comments. And the ratio stayed mostly the same since yesterday, usually it took ~2h for a new post on lemmy.world to appear on Feddit, Feddit actually had 3 comments more than lemm.ee yesterday^^

this seems to be the case with the larger instances. there has been a lot of people banging on it in matrix chat. Based on the notes it appears that we will need software changes before this can be corrected.

Also there are still bugs with the language selection when posting. If left blank not everyone can see the posts.

Quite many comments that were over an hour old were missing. I guess there’s a problem with the federation.

I opened an issue on Github about the replication failures of posts and comments between servers. It is not really getting much attention: https://github.com/LemmyNet/lemmy/issues/3101