I’ve spot checked other new posts too, but am missing two posts here: https://lemmygrad.ml/c/science?dataType=Post&sort=New

A post made from ml has federated to grad in the last hour: https://lemmy.ml/c/science?dataType=Post&sort=New

I’ve spot checked other new posts too, but am missing two posts here: https://lemmygrad.ml/c/science?dataType=Post&sort=New

A post made from ml has federated to grad in the last hour: https://lemmy.ml/c/science?dataType=Post&sort=New

No worries. I suppose such temporary federation problems happen occasionally, but you wouldn’t notice if you only browse a single instance. Do you know if any of the involved instances was down or unreachable around that time? Then it would be normal that federation gets paused for a time while waiting for the instance to come online.
I was able to xpost via Hexbear throughout, and could then see my posts from/to hexbear to xpost elsewhere. I didn’t check whether federation was working or not from anywhere else.
Both have had some blips recently that I’ve hit, but I was noticing more issues with Hexbear downtime than Lemmygrad.