Trying to reenable vanilla sand behavior

[JustImagineIt]

I've added these two lines to the code. I was able to uncancel the falling of the sand, that works fine. The thing is, the sand won't land, and the codeblock that's meant to detect when the sand lands doesn't seem to do anything either.

https://imgur.com/AD5XW8j

 

[RodaballoXD]

Could you explain what you are trying to do with that code?