Standard fade shader lit through walls

Hey, I'm having a problem with the standard fade shader. If you check the attached screenshot, you can see how the first screen works as intended.

In the second screen, I added a wall, thus I expected the blood texture to be affected by the shadow, which it isn't. The wall itself is working correctly, as you can see from the screenshot.

Another note, if the blood texture uses any other mode but "fade", everything works as expected. However the texture looks best with the fade mode. So does the fade mode just ignore the wall, or am I doing something wrong? Is there anything else I can do?