Snow shader not applying correctly to some meshes

When using CS v.1.4.6 some meshes have their snow shader applied incorrectly. The screenshots were taken without any mods modifying the meshes or textures (not even using SMIM). I could find two examples so far:

1. Windhelm Bridge Revived: as seen in the first image, the wood planks don't get the snow shader applying correctly. I played around with In-game patcher to rotate the mesh and the shader seem to work in the position seen in the second screenshot.
2. Capital Windhelm Expansion: this particular mesh seems to be getting snow even when fully vertical. By rotating the mesh in-game I noticed that if you flip the mesh while keeping it vertical, the snow shader doesn't apply. An additional issue is that shader doesn't apply when the mesh is slightly tilted as seen in the screenshots.

Windhelm Bridge Revived

Capital Windhelm Expansion