I noticed that Chunk#contains(BlockData) appears to have 2 issues:

1) it appears to only check default states, ex:

Chunk chunk = player.getLocation().getChunk();
if (chunk.contains(Material.CHEST.createBlockData())) {
    player.sendMessage("CONTAINS CHEST");
} else {
    player.sendMessage("DOES NOT CONTAIN CHEST");
}

This will ONLY check if the block exact matches the default state, ie: NORTH
If I place a south, east, west chest it will not match.

2) It appears that once it does return true, if you break the chest it still returns true.
After re-logging (chunk unloads then loads) it resets

Steps to reproduce:
(using the provided plugin)

• place a chest in any direction other than when you're facing south (facing south = north chest)
• stand on top of the chest (ensuring you're in the same chunk as the chest)
• run command `/test`
• You will see the message "DOES NOT CONTAIN CHEST" (should not do this)
• Face south (ensures chest will face north) and place a chest in front of yourself
• stand on top of the chest (ensuring you're in the same chunk as the chest)
• run command `/test`
• You will see the message "CONTAINS CHEST" (as expected)
• break the chest below you
• run command `/test`
• You will see the message "CONTAINS CHEST" (this should not be happening)