Shadows not visible in high graphics. (Mobile)

System information:CPU, GPU:Qualcomm Snapdragon 8 Gen 1 SM8450, RAM:12GB.
problems
1:Load the object from the runway.
2:Adjust the camera so that the object is captured and a little bit remains.
3:Lower the camera until it touches the ground.
4:When you look at it, the shadows and light and dark disappear.
(If you leave the game and come back, the bug will be fixed.)