Appearing Colorful noises on particular parts in Electric Dreams Sample project

I am trying to do render in Electric Dreams Sample project. When adding vehicle level into Electric Dreams Env map,
I have got so many blinking colorful dots (noise) in the forest scene.
That is not only editor layout but also rendering.
I tried to tweak around parameters for lumen reflection but it doesn’t erase them.

Do you have any good ways to solve this issue?

Thank you for reading and helping in advance.

coorful-noise

My PC spec:

Windows 11 Home
RAM 32GB
NVIDIA GeForce RTX 5070 (12 GB)

UE version:
Unreal Engine 5.3.2 and 5.7.4