Yes. I recommend you look here.
If you're from Lemmy.World and post in a Beehaw.org community then Lemmy.World users will still see your post. But no other instance will. This is because all other instances look to Beehaw to get Beehaw posts. And without Beehaw federation your post never makes it to Beehaw and therefore it never reaches/gets relayed to other instances.
I personally blocked those communities. They just took up too much of my feed with low quality content.