I discovered this issue concerning command blocks when in survival mode:
What I expected to happen was:
Command blocks take time to be destroyed when punching them in survival mode.
What happened was:
They break as fast as leaves when using shears.
Steps to reproduce:
Type /give YOURPLAYERNAME 137 64
Place as many command blocks as you like
Make sure you are in survival mode ( /gamemode 0 ) and break the blocks with your fists
I am not sure, this might be intentional. But it feels strange that only op'd players in creative can program command blocks, but players in survival can break them easily. They should have the resistance of obsidian, or at least of stone, to prevent players breaking complex redstone structures.
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Maybe they shouldn't break in survival at all as players can manipulate stuff in maps.
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I think this has been fixed. As per the minecraft wiki (I know its community based, but it seems this is actually intended), command blocks are no longer minable in survival. http://www.minecraftwiki.net/wiki/Version_history/Development_versions#13w19a
Confirmed in 13w11a. Not a terrible bug, though.