Stripped Hyphae and Stems have different map colors despite similar texture

The bug

For Warped and Crimson Stems and Hyphae the respective stripped variants look the same in gameplay, but have different colors on the map.

Expected:
As the textures of stripped stems and stripped hyphae look the same, I would expect them to have the same color on the map

How to reproduce

Go to an open, flat space. The following commands fill a small area to the south-east at the level beneath the player feet with warped/crimson hyphae/stems. Observe colors on a map. Compare to in world textures and colors.

/fill ~ ~-1 ~ ~4 ~-1 ~4 minecraft:stripped_warped_hyphae
/fill ~5 ~-1 ~ ~9 ~-1 ~4 minecraft:stripped_warped_stem[axis=z]
/fill ~ ~-1 ~6 ~4 ~-1 ~11 minecraft:stripped_crimson_hyphae
/fill ~5 ~-1 ~6 ~9 ~-1 ~11 minecraft:stripped_crimson_stem[axis=z]

Code analysis

Code analysis by [Mod] Avoma can be found in this comment.

Related to

MC-175228 Many stripped wood and log blocks have incorrect/inconsistent map colors