Ok so I was on my world trying to set and test some commands. The executions weren't working (i was typing in command blocks) I thought well maybe the execution I was trying to input wasn't possible, so then I typed in commands that I've executed before and even they didn't work. The only commands that were working are the ones you type in chat. I know the game has a history of having non functional commands  (Example : /particle) I was trying to use the /execute command combined with a few others, but every time the game gets updated it seems to become more challenging to execute certain commands. I'd have to make changes to them like putting @e instead of @s that would've worked previously but now the commands don't seem to be functioning at all in command blocks at least. Can this be fixed?