Hello,

Pardon my curiosity but a bus shelter normally has amenity=shelter + shelter_type=public_transport, but no building tag.

Tagging it as a building is only seen for rare cases where there is a sort of bunker made with bricks that acts as a shelter.  But plastic and glass devices installed by JCDecaux or Clear Channel never qualify as buildings in OSM.

Would you mind reconsidering the way you tag them?