A pixel on the stairs block seems to be shifted by a subpixel amount. This previously affected regular brick stairs as MCPE-10202, but has since been fixed for said blocks.
Linked issues
duplicates 1
relates to 2
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Comments 4
Duplicate of MCPE-28160 (or should it be resolved the other way around?)
Mark as duplicate of MCPE-31752; I have provided more detail there, as this glitch affects more blocks than stone brick stairs.
Confirmed; does not affect Windows 10