When create an RTX world and turn ray tracing ON everything is black

When create an RTX world and turn ray tracing ON everything is black as if texture pack is not loaded. I tried all the worlds but still get the same black textures (see screenshot). 

 

Minecraft Beta version: v.1.15.0.8

Nvidia driver: 445.87 WHQL Game Ready

Default settings

 

System: R5 3600, 16GB RAM, RTX 2060 Super, Samsung EVO SSD

Win 10 PRO, Build 1909