When executing any command in the chat box, there is no output following the command like normal. For example, when typing "/gamerule spawnradius 5" there is no response in chat, when the chat would send an automated response that says "Game rule spawnradius has been updated to 5". Please note this only affects some worlds and not all.

Gamerule "sendcommandfeedback" is set to true, along with gamerule "commandblockoutput".

TL;DR: chat doesnt show command output