When change the GUI scale to -1, the top textures of block inside the inventory appear smeared and blurry. However, when the GUI scale is at 0, it looks completely fine. Restarting the game does not seem to do anything, nor does changing any of the other settings. This is in handheld mode.
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We're tracking this issue in MCPE-47374, so this ticket is being resolved and linked as a duplicate.
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