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.
Linked issues
is duplicated by 12
MC-149096
Underside texture of sandstone wall missing when placed on top of a bell
Resolved
MC-150996
Bell makes wall see-trough!
Resolved
MC-159612
Fence and Wall blocks placed on top of a bell have no bottom texture
Resolved
MC-164369
Grindstone missing texture
Resolved
MC-178878
Grindstone not rendering top texture
Resolved
7 more links
Attachments
Comments 30
I assume this is due to the full bottom face being enclosed within the hitbox of the top face of the bell, which causes the game to believe the face is completely obscured by the bell, hence the culling. This could have been fixed if MC-163737 is, but that's intended now apparently.
Still 21w03a and 1.16.5.
Lists that bottom model is missing:
Fences
End rod
Walls
Grindstone
1 sea pickle block
Flower pot
Candle
Hopper
20 more comments
This is actually an issue with bells, not lanterns.