First notice: While playing with my friends on a skygen, I noticed that when I move my character's head down the windows taskbar would show up, even though I didn't have any UI's open such as the pause menu or player inventory, just for clearification I had (and still have) my Minecraft's fullscreen disabled.
Summery: Even if you don't have a game UI open, when moving you're character's head down, you can accidently open the Taskbar potentially causing accidents while playing.
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We're tracking this issue in MCPE-19965, so this ticket is being resolved and linked as a duplicate.
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