I tried to turn on the Deferred Technical Preview and also installed a resource pack with a Shader, but the shader doesn’t work. It’s saying that my dedicated graphics support DirectX 12. I downloaded the latest version of NVIDIA Graphics. The DirectX 11 is not my NVIDIA.

Note:
It's NOT same like this by: MCPE-173996 and MCPE-166351

MCPE-173996 -> it talks about AMD Graphics on DirectX 11.

MCPE-166351 -> it talks about Intel Graphics supports the DirectX 12.

You have to understand that my NVIDIA supports the DirectX 12, when I entered the Minecraft, it shows the screen “D3D11”. It’s not simply.