When entering a Nether portal, the game does not remove the terrain loading screen, making it mandatory to close the application. When you enter the world again, you appear either in the coordinates that you were in the Nether but now in the Overworld or at the reverses, that you appear in the coordinates of the nether in the Overworld
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We're tracking this issue in MCPE-173386, so this ticket is being resolved and linked as a duplicate.
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