Snow covered grass/podzol/mycelium block side texture does not match original block

The bug

Snow covered grass, podzol and mycelium blocks use a different dirt texture on the side than the "normal" variants of those blocks.

How to reproduce

1. Place a grass, podzol, or mycelium block
2. Put a snow layer on the grass/podzol/mycelium and look for the incorrect change of texture
   → In all cases, a few pixels of the dirt block also changed, and for mycelium, the grass part did as well