Hello,
Since a lot of version I have this problem ... When I copy a command block with the click wheel and the control key, the command is copied inside, however the “Conditional” option is not saved which is problematic in the following situation.
If I place a chain command block with a teleport command following a reapeting command block, the player is endlessly teleported to the same place, the only solution is to remember the coordinates of the command block to delete it ...
Besides, it would be great to have a gamerule allowing to stop the command blocks as on the servers.