Regularly placed stairs will reconfigure to a corner stair when next to an inverted stair. Tested with wood and stone brick variants and both types of corner stairs can be caused.
Unsure if bug or feature, but it didn't do this before I updated.
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Probably a duplicate of MC-88847, let us know if the fix for that doesn't fix your issue.
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Actually a different bug. Reopened and confirmed.
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Fixed in 15w44b or a previous snapshot.