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It's hit and miss. Some instances are sending the same activity 2 or 3 times, and there's a theoretical maximum on the number of activities that an instance can process, so whether federation of a particular thing happens depends on how whelmed a server is at the exact moment you send it.
I've also seen a comment from lemmy.ml not being acted on by LW, so there are some drops happening.
I've seen lemmy.world federation issues pop up enough times that it seems more than plausible that they're size is impeding their ability to federate correctly. Now their being big also means there are more opportunities for federation issues to be noticed, so maybe who knows.