Floor bell hitbox is too big, causing erroneous culling of adjacent blocks

The bug

Placing a lantern, fence, or cobblestone wall on top of a bell will reveal that there's no texture there, and you can see directly through the block.

How to fix

The bell's hitbox should be changed such that it isn't a single cuboid, but rather captures the details of the bell and its stand just like the non-floor states do.