When placing stairs of the wooden and cobblestone varieties in the latest snapshot and then logging out and back in all the stairs placed in the latest version disappear, leaving behind a lighting glitch. However, stairs placed in previous versions then reloaded in 15w35b do not disappear.
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Strange that happened to me too, I wonder why it is happening now, also this also happens to doors somewhat, as they only half vanish.
CubeTheThird
Duplicate of MC-87194.