In my profile it says my cake day is today (June 13), but it was displaying a cake icon on my comments all day yesterday (June 12).
The icon was a black and white outline so I thought maybe it was showing it the day before on purpose so other people would see ahead of time, and that it would turn colorful on the actual day. But then midnight hit and it disappeared, so it must be a bug instead.
Lemmy updates are a little touchy and buggy, can’t blame them for taking their time. It’s only been out for like a week. They have to load a backup on another server and test it out to see if there’s any issues with the upgrade and how long it’ll take. They have to plan downtime and set aside enough time to do it, handle any issues and a potential rollback.