CommandBlocks issues
MC-73228Detect command not working in 1.8.1 Pre 2
Duplicate
MCPE-54050Entity detection with brackets [] detects wrong place
Incomplete
MCPE-82333Chain command Blocks doesn't Execute when passed by Impulse Command Block
Incomplete
MC-194759The command block does not change the block at the point (door)
Duplicate
MC-207909There's a chance that Execution Command Blocks Fails to detect entity.
Invalid
MC-262680Chain Command Block Repeatedly Triggering
Invalid