No shadow inside a car on unofficial map

So I just cruise through a random map with a Tograc, and then I saw something off. Inside the tunnel, there is no shadow. Panicked, I "Ctrl+C" and go outside to see what happened. But the shadow is there, then I go back to the car, the shadow is gone again. So I decide to slow the camera down and move to the left until the camera is outside of the Tograc. And boom, the shadow appeared. I tried this on Safe Mode too, download 2 maps and use the same Tograc, and the results is still the same. And then I load the Official Maps, Automation Test Track and Small Island and the shadow not disappear when inside the car (Normal/as expected). So anyone can explain to me what's making this shadow disappear thing?

Inside the car

Outside the car

Yes I know the screenshots were not in the Safe Mode. But the same thing happened too in Safe Mode on Unofficial map.

 

probably because its not an official map

 

Does it have anything to do with PBR Textures not being on the map?

 

i have no idea but is the map an old mod

 

"Last Update: Jun 22, 2017"

Hmmm. looks old to me

 

It seems like this is an issue for old maps. I'm using this old map because I want to record my BeamNG.roleplay here for the Intro, since it's the right place for the video topic. Maybe I can fix the map myself. Admins can close the thread now, thanks.