Signs attached to the sides of blocks have hit/break particles of different wood types depending on orientation

Hitting & breaking signs that are attached to the sides of blocks will create particles of varying wood types, depending on the side that the sign is attached to. North side->spruce, east->jungle, south->acacia, and west->birch. Breaking a sign attached to the top of a block always creates oak wood particles, which is intended.

Steps to reproduce:
1. Place signs on all 4 horizontal sides of a block.
2. Go into survival mode and punch & break each of the signs.
3. Notice how the particles are all of different wood types.