Always on display does not work properly on my s8 since the last update of May 2019. Even if set to permanent display, the clock disappears 5 seconds after closing the clear view case. After many searches, or changes in settings, it does not work. I notice many other users with the same problem (see the last comments on the google "Samsung Always on Display" apps, for example the user "Rv Geho"), so it must be a bug from the update.
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