Minecraft Scoreboard wont go up for stat.mineBlock.minecraft.obsidian / Picklaxe with "CanDestroy:[minecraft:obsidian]"

The Mine craft Scoreboard wont go up for stat.mineBlock.minecraft.obsidian
if you use a :can break block" pickaxe

For example:

/give @p minecraft:diamond_pickaxe 1 0 {Unbreakable:1,CanDestroy:[minecraft:obsidian],ench:[{id:32,lvl:100},{id:33,lvl:100},{id:35,lvl:100},{id:34,lvl:100}]}

if you use this pickaxe to destroy obsidian your score wont go up if you have un objective of "/scoreboard objectives add Obsidian stat.mineBlock.minecraft.obsidian"