Fire animation appears in lava block not on burning item next to it

Problem: When a wood item catches fire due to proximity to lava, the fire animation shows on the adjacent lava block instead of on the item catching fire.

Steps to Reproduce: 

**(This mimics what I saw in my world; other arrangements might also exhibit the bug)

1. Create or find a vertical wall 5 or so blocks high

2. Punch a one block hole about 4 blocks up and put lava source block into hole, creating lavafall down the face of the wall

3. Place a cobblestone block at ground level (where the lava is spreading out) right next to the lavafall

4. Place wooden stairs on top of the cobblestone, so they are touching the lavafall

5. Observe fire animation (eventually) on the lava pool formed at the base of the cobblestone, not on the stairs; the stairs are destroyed eventually and the fire animation disappears

I will post a picture of this later.