This pops up regardless of lock screen status. If I add and remove the magnet while unlocked, it does not get locked. There is also third screen with music controls when music app is running.
Why does this happen?
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It's a feature to display useful info and interact with it when you're using magnetic case for Huawei Honor 6. Searching for "Huawei Honor 6 magnetic case" will show how it's supposed to be used:
(Image courtesy of Lelong.my)
From what I researched, most of Honor 6's magnetic cases have small cut-in on the front-right side where you can touch the screen to interact with the phone while the case is closed.