Good day, Mojang Studios!
I have caught bug that makes command blocks A N N O Y I N G. So today I found is; when I get a command block, then I place down the repeating one, then I knew there’s a syntax. Then I fixed it the second attempt won’t make it execute, how annoying! fix this. I love commands. xD.

Steps to reproduce.

1. Get a command block.
2. Placed the command block 
3. Found a error.
4. Fixed it.
5. The second attempt won’t work.
   Results
     Observed Results
   The command block won’t active on the second attempt.
   Expected Results
   The command will activate on the next attempt.

Note: I couldn’t get a video, because this website only allows 10.00MB but Apple Inc recordings are more then 10.00MB.

Edit: Sometimes when you open the command on the second attempt, the command will stop working.