Stairs let in light;they should not.
What I expected to happen was...:
I expect no light to be let through, since stairs are opaque.
What actually happened was...:
A bit of light seeps in. Note if smooth lighting is turned off this bug does not occur. It only occurs with smooth lighting on.
Steps to Reproduce:
In a light area, enclose yourself in a house made of wooden stairs. It should be completely dark. Observe the lighting glitch.
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duplicates
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This issue duplicates MC-92.

Indeed it does. For some reason that is marked as resolved & fixed. Perhaps it went away in a previous version and has come back now?