The bug

The color used on maps to represent for the bark of pale oak logs, or any face of pale oak wood, is incorrect. It appears using the same color as stone, despite having a greatly different appearance. One would expect it to have a color representative of its actual appearance.

How to reproduce

1. Run the following commands:

   /fill ~1 ~ ~1 ~10 ~ ~10 minecraft:pale_oak_wood
   /fill ~-1 ~ ~-1 ~-10 ~ ~-10 minecraft:stone

2. Obtain an empty map, and fill the map
   There is no difference between the color of stone and pale oak wood on the map