Fortnite trees don't load?

I have the textures on epic in Fortnite in the graphics settings. Since my PC doesn't pack Fortnite so well, I wanted to lower the Grsfik setting. I was able to reduce all settings easily, except the textures. Whenever I set the textures to low / medium, the textures of the trees, bushes and self-made buildings no longer load. If I then switch back to Epis, it will work again. Can you tell me what is wrong with the tectures not loading and how can I fix them?

Verify the game in the loaf

I know i am late lol but u can change only textures to epic