commandBlockOutput = false does not show command feedback of commands executed for player

The bug

If the gamerule commandBlockOutput is set to false command feedback of commands executed for a player is not shown anymore. It used to be shown in 1.11.2.

How to reproduce

1. Open 1.11.2
2. Set commandBlockOutput to false

   /gamerule commandBlockOutput false
   

3. Use the following command

   /execute @p ~ ~ ~ setblock ~ ~ ~ stone
   

   → It says "Block placed"

4. Repeat steps 3 and 4 in the latest version
   → There is no command feedback