There's a major incompatibility with newer versions of the Lemmy software where Sync shows a comment count but cannot display the comments. So at the moment I can't see any comments from posts hosted on sh.itjust.works. I know that there's other less severe issues too (I think spoilers are semi-broken in some instances).

[–] Waffle@infosec.pub 0 points 4 hours ago

The summary updates don't work for 90+% of posts (idk if the feature is available for free users - wanted to support development and bought the lifetime membership).

Also I persistently get a notification that there are no messages to return. I can't seem to get rid of it.

I'm sure there's other stuff, but these are the ones that I notice.