Why do not you see anything in spec in Minecraft 1.14?

In the Minecraft 1.14 you can't see anything in the Spectator like you can do something about it?

What do you mean by "you can't see anything"? Do you have black image or are all blocks suddenly invisible as if the world was empty?

All blocks are suddenly invisible

So if you're supposed to float "in the ground" in spectator mode (which you can do by default in the Spectator) then that's normal, because you have to recognize something when "flying through walls". But if all the blocks are invisible, I can't help you either.