Water, when placed in a two by two pattern with water elevator blocks underneath, changes one column's one side into a green transparent pumpkin texture.
To recreate the problem, make a 2x2 hole, replace bottom with magma or soul sand blocks, then fill in with water, one column's top texture will bug out and become transparent.
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We're tracking this issue in MCPE-156281, so this ticket is being resolved and linked as a duplicate.
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