The texture for the mud brick half slabs are incorrectly flipped on two of their sides. The North and West sides of the block are flipped backwards resulting in the brick lines lining up incorrectly. This makes the bricks look strange when combining slabs and full blocks. None of the other slab types flip the texture this way.
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duplicates 1
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We're tracking this issue in MC-250692, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-250692, this is actually an issue with mud brick itself.