I'm not sure that it ever quite worked - the videos currently on Lemmy are likely to ones brought in manually, rather than new ones that have come in via federation.
The community copies (on lemmy.ml, endlesstalk.org, etc) all show 0 subscribers. At a guess, it's because the format of the Followers collection on PeerTube is slightly different - it doesn't have the empty 'items' array that Lemmy expects, so it just rejects it. As such, any new posts will also get rejected by Lemmy (the same way it does if a community genuinely does have 0 subscribers). A couple of Updates have come through, so maybe Updates circumvent that check.