Map color for mud bricks, mud brick stairs, and mud brick walls is incorrect

The bug

The map color for mud bricks, mud brick stairs, and mud brick walls is incorrect. The color appears to match the color of stone on a map.
Strangely, mud brick slabs do not seem to be affected by this issue.

How to reproduce

1. Obtain and fill a map
2. Place mud brick slabs
   The color appears brown
3. Place mud bricks, mud brick stairs, or mud brick walls
   The color appears gray, like stone

Expected behavior

The mud bricks, mud brick stairs, and mud brick walls would appear brown, like the mud brick slabs.

Actual behavior

These blocks appear gray, like stone.