Summary:
Campfires can be placed on the sides of blocks above air and whatnot, however if you go to place a campfire above another campfire it won’t let you place it, no matter what block you try to place it from. Nothing strange happens if you place a campfire below another already placed campfire so I figured this must be a bug.

Steps to Reproduce:

1. Place down a campfire
2. Try to place another campfire above it

Observed Results:
The campfire cannot be placed.

Expected Results:
The campfire should be able to be placed above the campfire.