/tick doesn't work in command blocks

(i know this is a duplicate of MC-266157, just trying to make it more clear about what he/she was talking about.)

/tick isn't working in command blocks, I have been trying to make it work for 1 hour and 35 minutes, and haven't been able to get it working. It works in console though, which i find weird.

What I expected to happen was...:
To stop the tick rate, using a repeating command block

What actually happened was...:
Unspecified syntax error, does nothing and the command isn't wrong.

Steps to Reproduce:
1. Place a command block, of any type.
2. Write "tick freeze"
3. Run the command in the command block.