[MC-205876] Visual Bug.

Found a Visual Bug with the Polished Diorite Slab, the line isn't centered.

Environment

Windows 10, GTX 1060 6gb, i7-6700, 32gb ram

Thank you for your report!
We're tracking this issue in MC-158295, so this ticket is being resolved and linked as a duplicate.

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are you sure you aren't using optifine?