All stairs have a line threw the entire block and does not match their preview in the item bar or inventory screen.
What I expected to see (ie. quartz stairs)
http://i.imgur.com/S4cvXJn.png
What I saw instead
http://i.imgur.com/k6soVtN.jpg
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If you did not already, please remember to perform a search before creating a ticket to see if your bug hasn't already been reported.
This issue was reported previously as MCPE-8054; comment your experience there!