Oh god, I just realized that when you make an image post, every single instance tries to cache the image at once: https://pastebin.com/fN14dRdA
Edit: I moved the image to Imgur instead of hosting it on my phone, but the post edit doesn't seem to federate...
Edit 2: It did federate to lemmy.blahaj.zone. But on lemmy world I can't even see the comment edit. Hmmm.
Edit 3: Situation improved. Edits did federate to lemmy.world now. Seems like other stuff is federating again. There's probably just large delay due to load.