lemmy.ca defederated from hexbear.net and lemmygrad.ml, who are driving top-level comments on here. Since you can’t see the top-level comments, you also can’t see any discussion below.
I opposed lemmy.ca’s decision to defederated from hexbear based on the perceived behaviour of hexbear users on other instances for exactly this reason: I think an instance’s role is to police the actions of users posting to that instance, not to police their users’ exposure to other instances.