Recently when I edit my sleep times in the Garmin Connect Android app I've noticed a bug.
I edit the bedtime, hit okay and the time recorded doesn't change. I go into edit again, the time I'd changed it to displays, select okay and then it changes.
It is reliably taking 2 edits to change the bedtime. With the wake time I only need to edit once and it works correctly.
This is in version 4.76 on a Google Pixel 7a