Lemmy.world is apparently rate limiting the wefwef.app domain. They are working on resolving it. In the meantime you can try the suggested solutions in their community https://lemmy.world/post/801298
For example self hosting it or using other's publicly available versions of it like https://w.opnxng.com/ though you should always be cautious using other's instances.
I actually love how they have taken a level headed approach to this whole saga and have not let themselves get swept up in whatever the community at large is doing. They're looking at the issue with their own eyes and evaluate whether or not it is prevailent enough to take the big decision to defederate. If we start defederating from every instance for every infraction a single user on it makes, we will isolate ourselves into an echo chamber worse than most corporate social media. So bravo to the admins for looking into it as much as they have.
Shouldn't window's compatibility mode solve most of those?
We still see their posts and can comment on them amongst ourselves. Though no one on beehaw or other instances will see our comments, not even their mods. So in a sense, unless lemmy.world can moderate these shadow copies themselves, these beehaw communities will be unmoderated hellscapes on this instance.
Well technically... https://youtu.be/jyQwgBAaBag