Sand and other blocks have darkened outlines, it doesn't really affect anything gameplay-wise, its just mildly annoying to look at the blocks
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Does MC-1794 happen to describe your issue?

Looks more like MC-114265
Mipmapping is disabled in the screenshot, so this is a duplicate of MC-1794.
Thank you for your report!
We're tracking this issue in MC-1794, so this ticket is being resolved and linked as a duplicate.
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