Only realms and servers or multiplayer games need internet.However,i can't play the game without internet because the app will try to login in xbox live and then crash.I can't even successfully open a map on my own device for it'll wait for the login.
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Bugs regarding the game Minecraft belong in the MCPE project. Moved to the correct section
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-33316.
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