Edit: Hi Lemmy users! You can't see the screenshots I've attached to this comment. I've just learned this thanks to @B1naryShad0w. If you'd like to see my comments with the screenshots, please view this comment thread via kbin by clicking this link.
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I've looked at a few examples, and I'm just super confused now. I've also tried searching for a simple explanation of what exactly defederation does, and I keep seeing conflicting descriptions.
Let's look at two examples (please bear with me as I only know how to attach one image to one comment at a time.) On this comment let's look at AskLemmy, a lemmy.world community, from Beehaw:
Notice that all threads (with one exception) were posted almost a month ago when defederation happened. That one exception was a Beehaw user who posted to AskLemmy 5 days ago. So we can see that BeeHaw, having defederated from lemmy.world, is blocking 100% of new content from this lemmy.world community, except for that one thread published by a Beehaw user who seems to be out of the loop 5 days ago.
Mostly makes sense to me so far. Beehaw defedearted from lemmy.world, so Beehaw can't see new stuff from this lemmy.world community. A little weird that there was a new post by a Beehaw user, but that still makes some sense with my previous understanding of how defederation worked, since I think(?) defederation is one-way. After all, if defederation was two-way, then how did a Beehaw user make a thread on lemmy.world?