In PS4 Version, fog maybe not show up

First of all my English is not good, please forgive me for the content
I am a novice,The problem is this, when I set bsharematerialshadercode to true, the ExponentialHeightFog in one of the levels of my project may become invalid. Restarting the game or loading savefile may reproduce this problem.
I have tried many solutions, but none of this problem can be solved. If you understand this part, thank you very much