This issue is a cosmetic/texturing issue where the "Worlds" button has slightly conflicting textures with the scroll menu where you can see your worlds. This issue is especially apparent when the button isn't selected.
Steps to reproduce:
Click the play button then observe the edge between the worlds button and the menu for it
Extra notes: This does not affect the servers button.
[media][media]
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Duplicate of MCPE-160103
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We're tracking this issue in MCPE-160103, so this ticket is being resolved and linked as a duplicate.
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