Since updating to 1.2.0 on windows 10 edition in my realm I can no longer hold left click with a shovel to clear more than one block at a time. It will just clear the first block and then stop. Pick axes still work just shovels as far as I can tell. My single player works it still works just fine in.
This seems to be a problem with efficiency enchantment. I have efficiency 5 on the shovel that doesn't work. If I use a shovel without the enchantment it's fine. I have the same issue with a pickaxe with efficiency 5, but only when mining netherack. It appears to be something with a tool being too efficient for what it's trying to remove. Something like it does it too fast so it doesn't do the next one.