There have been a couple of bugs discovered specific to the new Galaxy Wear Active Watch and Samsung Health.
First - the Wear Active does not show up as an option to view as the source of data for the step count. See this reddit post for details:
Next - the option to edit sleep times is not available for the new Active watch. This is very annoying to me since I read before going to sleep and the watch decides that when I start reading, I'm actually going to sleep. This is outlined in this reddit post:
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