No idea how it actually works, but I wonder if there isn't a separate timeout on the sleep cover that shuts it back off in a minute or something if there is no further input after waking. This would make some sense to be built in for when the cover got accidentally opened a little bit when it was not meant to be. When it's consistently happening shortly after opening the cover I don't think the sleep auto-timeout continuing would by coincidence end up being that short of time all the time.
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