Trapdoor UV-mapping is wrong on Oak and Dark Oak

The UV mapping isn't done correctly on the Oak and Dark Oak trapdoors. Because the Vanilla Minecraft texture is symmetrical, it's not noticeable. It does become noticeable when applying a texturepack (screenshots with texturepack included).

All 4 trapdoors are hinged on the side of the Sandstone block, yet only the Jungle and Acacia trapdoors behave like they are. Oak and Dark Oak have their textures in North-South direction (always) when placed, and opened the texture just shows as it is, even when the trapdoor is upside down.