Before I start this is similar to MC-29613 except this one has a difference. I test this on 3 normal worlds and one flat world. The Bonus chest always spawned hovering above the ground by 1 block. There are no ghost blocks or nothing. Also no torches spawned unlike MC-29613. The only time I got a torch to spawn was in a tree. In the flat world it spawned normally. So in conclusion the Bonus Chest spawns 1 block above the ground with 0-1 torch. I provided some images.
Here is the seed for one of the Worlds: -3581565164056792421