I am repeatedly disconnected from Minecraft when I Alt-Tab to another window (or just out of Minecraft). When I return back to the game there are visual glitches (gray/blank areas where the world is missing) and I am disconnected from the realm.
Related issues
duplicates
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Yes, I was playing in fullscreen when it happened. That's an easy enough fix then. Thanks.

Why is this marked resolved?
This issue is still present in the current version of bedrock, and the claim that "This is unavoidable in fullscreen mode" is demonstrably false.
No part of the Windows application life cycle requires minimised fullscreen windows be suspended, and there are literally hundreds, if not thousands, of other full-screen applications that do not exhibit this behaviour.

I am also still having this issue. I agree with Robin, this issue is not "solved". You have a workaround, yes, but that does not solve the issue. How come Minecraft for Windows 10 is the only Windows game that I have ever played that does this, if it is "unavoidable". No other game does this. This has been known for nearly three years now, only to be handed a "deal with it" response.

I have this issue all of the time if you can do it on Java, do it on Bedrock. I know that Java uses, well java and Bedrock uses C++ but its not a matter of that you just need to stop the system from thinking that you lost connection. But then again its a windows and microsoft problem so it will never be fixed. Take all of minecraft bedrock for an example and all of the bugs on the bug tracker, there is no such thing when microsoft is in charge

It still does this.

Bedrock still does this.

Still an issue in Bedrock, but the discussion and answer seems to lie in MCPE-19393. The tl dr is that the (unfortunate?) choice to use UWP makes this "working as intended".

This still occurs in the Windows version. Running in "windowed mode" is a terrible workaround given that windowed mode still leaves the title bar and taskbar visible and it looks like garbage. If I alt tab for even a few seconds in full screen, I get kicked out of the realm.
No other windows game does this.

Still broken 09/06/2024 (I was able to fix it with a hex edit). Forcing windows mode is NOT a fix.

In what way is this resolved?
It's resolved as a duplicate of MCPE-19393.
Are you playing Minecraft in fullscreen? If so, switching to another application will cause the app to be suspended, which makes the server think the connection died. This is unavoidable in fullscreen mode, and it also happens if you minimize the app window or switch virtual desktops. See MCPE-19393 for more information.
The only way I know of to avoid this problem is to run Minecraft in a window and not minimize it when switching apps. A maximized window is only slightly smaller than a fullscreen window so it's negligible loss of image size.
This is probably a duplicate of MCPE-19393.