Command blocks not working in Minecraft

So, i tried to use command blocks on the nether update and it’s not working, i though that it was because of being just a snapshot, but logotzip can use command blocks, so it was weird, i tried using a simple command on the block and it didn’t work, I’ve tried everything and nothing is working, can someone explain me why is this happening?

  • Yes, I tried Buttons, Levers, Blocks, Torches, Observers