If you place a stair block on a grass block, the grass block will not turn into a dirt block, which is what is supposed to happen. You can see this problem in the screenshot below.
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Transparency is just a texture. I could make the wooden planks invisible and it would remain the same. I could make the stair block look like an ordinary wooden plank.
@Matthew: You clearly don't know what I am talking about.
Read this: http://www.minecraftwiki.net/wiki/Opacity
Intended. See MC-1505.
Stairs are transparent blocks thus grass won't turn into dirt.