chests move to open state on certain circumstances and produce a random pitch when first opened.

experience:

when I place down two chests to get a double chest and I open it, it makes the normal sound, but with a strange random pitch. Plus, when I remove the fist chest I placed, the other part of the chest appears to be open, but no window pops out.

reproduction:

**1. place down two chests (double chest)

2. open it

produces a random pitch, but only the first time

3. remove the part of the chest that corresponds to the first chest placed

the chest remaining seems open. Note this does NOT happen if the other part of the chest is removed, instead of the first.

expected result:

**nothing happens at all.

actual result:

**random pitch and open chest bugs appear.