The collision box on the corner cobblestone wall block is a square, when it should be an "L" shape, preventing players from walking into an inside corner.
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That is because the corner fence's collision box is a solid rectangle instead of following the shape of the fence.
I noticed this recently in 1.4.4. I'm very certain it didn't exist until recently and as pointed out here, it doesn't exist with Iron Bars.
However, this also exists for Nether Brick Fence, Cobblestone Wall, and Mossy Cobblestone Wall. Seeing as Cobblestone wall recently had a bug fix regarding hit box (MC-1745), this was possibly caused by that issue being resolved.
this bug's been present ever since the fence collision boxes were updated in the beta. other types of fence positions got their hitboxes adjusted to their shapes, but this one was forgotten.
iron bars and glass panes are slightly different type of blocks than fences i think.
In the screenshot: When attempting to move forward, the player will just slide diagonally to the left or right.