https://lemmy.ml/c/flashlight@lemmy.world got that error a few minutes ago when lemmy.world was having some db probs, but works now. I had thought federated posts were supposed to be copied to the local server, and anyway a raw 502 is a confusing diagnostic. This is basically a bug report.
Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn’t work well for people on different instances. Try fixing it like this: !flashlight@lemmy.world