Lanterns Belong on Walls

How?

For supported lanterns, place the lantern on the side of the block, and the lantern will attach to that side.

Compatibility

Lantern's that inherit from vanilla's lantern are automatically supported through a dynamic block entity. This does not cover every lantern, but it should cover most.

For developers

If your lantern extends LanternBlock and does not override getStateForPlacement it will be supported by the block entity. If you don't extend LanternBlock or you do override getStateForPlacement, you should implement wall hanging on your own.