When you are inside The End and you defeated the Ender Dragon, the texture of the End Portal that will lead you back to the real world is already perfect but while you are still in the real world and just finished making the End Portal that will lead you to The End, the portal's texture looks buggy. New screenshot is attached.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-18165.
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i have that bug too