no crimson and warped trees in the nether

What I expected to happen was...:
I wanted to find crimson and warped wood

What actually happened was...:
there is no crimson and warped trees, crimson and warped biome are generated but the special floor is not and same for trees, there is no trees in nether forests,

I explored nether for hours and there is 0 trees in the entire nether, I generated 3 differents world for check and no more trees in the others worlds 

Steps to Reproduce:
1. Go to the nether