Acacia planks do not render on maps

Made a bridge of acacia planks in my world and then made a map. Stairs do display, but the planks themselves do not, instead a dark gray color. 

 

Recreate problem:

Build anything will acacia planks, then create a map of the area

Expected behavior:

Acacia colored build will show on map

Actual behavior:

Dark gray build shows on map instead