Since the most recent game update, if you have more than one monitor, the mouse will not stay in the game window, and it tabs you out if you left-click. If you put the game in windowed form and shrink the window down, you can see this happen even more clearly.
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We're tracking this issue at MCPE-230832, so this ticket is being resolved and linked as a duplicate.
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I made the new update a few minutes ago and also have that problem now. Yesterday before the update was everything working as usual.