The most recent version is having an issue where in when using multiple monitors a full screen Minecraft window will stretch an extra 3 pixels to any adjacent monitors, as well as will allow input on those monitors/applications. A similar situation is when you play the game in maximized mode non-fullscreen where moving the mouse down sets your cursor over the taskbar. Because of this when the mouse is moved into a space that isn’t directly within the Minecraft window you can accidentally click and un-focus the game, if I had to take a guess I would say the Mouse needs to be locked to the game window while the game is active (unpaused) and that ‘full-screen’ is the actual resolution of the monitor the window is on since it’s ‘leaking’ 3 pixels to the left and right.
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We're tracking this issue in MCPE-230832, so this ticket is being resolved and linked as a duplicate.
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same here, even using a single monitor when you manage some sort of invetory the cursor goes to random places