When you try to break a stair of any kind, you will se the part with the corner missing, darker than normal and you can also see the whole (even the part behind the block) Also when you make a corner conection with stairs, they apear to have a mixed texture of normal satirs and corner satirs.
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Thank you for your report!
We're actually already tracking this issue at MCPE-32907, so I will resolve and link this ticket as a duplicate.
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