Signs go through blocks if they are placed as shown in the picture. If this is a duplicate I did a search on things related to this, so sorry if it is.
UPDATE: Just noticed this seems to be due to the sign hitbox.
UPDATE 2: Added extra photo demonstrating height of sign.
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Signs are simply higher than 1 m == 1 block...
Yeah, I realised. But still, this should be fixed, as it cuts off the top line of text.
Signs should be lower if the game guesses that a block is placed right over it.

Is this still a concern in the latest Minecraft version 14w04b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Confirmed for 14w30c but probably intended and won't get fixed 😞
Confirmed in 1.8.2-pre6.
It's a sign.
Is it really not possible to fix this? All that needs to be done if slightly shorten the length of the sign post.

Added attachment
[media] to show that lower signs would definitely not look bad. The values are the rendering offsets in y direction used in the net.minecraft.client.renderer.tileentity.TileEntitySignRenderer.renderTileEntityAt(TileEntitySign, double, double, double, float, int)
method. The method net.minecraft.client.gui.inventory.GuiEditSign.drawScreen(int, int, float)
would have to be changed accordingly.