Door lighting bugged

For some reason when i make doors, the side facing away from where it faces you when you place it is always dark.

i think this has something to do with it not being a full block, and having same lighting mechanics as a regular block?

but i dont have any ideas of what could fix it, im not a technical expert.

and i also have smooth lighting on and trapdoors arent bugged

so idk what could make it not apply to doors.

any ideas?