weird campfire bussiness

What I expected to happen was...:

when you stay on an unlit campfire(not crouching) I won't get damaged.
What actually happened was...:
I got damaged, equally as hard by a lit campfire. also there is no sound when I get damaged.

Steps to Reproduce:
1. place a campfire
2. put water on campfire
3. remove water

4. go to survival mode

5. stay on campfire