A visual glitch that affects the air texture to z-fight with one that shouldn't exist there (grass, dirt, stone, lava) where there actually aren't such blocks and alterations of the textures of blocks that actually do exist (Spruce leaves turned to nether portal in screenshot).
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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What device are you using exactly and what OS version?
It is probably an issue with graphics card in your phone, but is this happening on other worlds as well? In game menus?