This morning I had an odd issue. I took a health snapshot per my usual morning routine. When I went into Garmin Connect, I didn't see it there under Today's Activity, which was a little strange. So I took a second one which did show up. However, the first one never appeared, even after manually syncing the watch.
As you can see from the screenshots, the watch recorded two health snapshots today. However if you look at Today's Activity from the Garmin Connect home screen, and if you look at the Health Snapshot log in Garmin Connect, you can see that only the second one is showing up.
This is the first time this has happened since I've had the watch, and hoping this is just a one-off glitch. But mentioning it in case anyone else experiences the issue.