Ore generation procedure problem - Forge 1.16.5 31.6.0

So I have big problem with ore generation procedure. I want ore to be hidden inside stone, not outside. 

Procedure:

If: [[Not]->(Is air at (x-1) (y) (z)) and (Is air at (x+1) (y) (z))...ect] = [True]

Do: [Return][True]

Below "If, Do": [Return][False]

This still isnt working. I can see generated blocks outside walls even if I used [Not] to deny spawning near air.

Maybe I just don't get it. Im new wit Return procedure, but I've done almost the same long time ago and it worked.

I tried with solid block without [Not] and it failed. I even tried [Not] with solid block and then [Return][False] -> [Return][True] and it failed too.