The issue

Glow lichens only have a single block state, multi_face_direction_bits, which is basically a glorified damage value, merging all of the properties of the block into a single value which pretty much defeats the purpose of block states. Consequences of this include:

• It's unnecessarily difficult to place a glow lichen in the configuration you want with commands
• It's impossible to detect a glow lichen in a specific direction, since you have to specify the entire bit field
• Issues like MCPE-122599
• Java disparity

Java does this with six different true/false block states, one for each direction.

How to reproduce

/setblock ~ ~ ~ glow_lichen["north":true,"east":true]
→ Error
Expected result
Glow lichen is placed with lichen on the north and east faces of the block