Most modded maps have a lot of missing textures. I've tried clearing my cache but that didn't change anything. Normal maps work perfectly fine.
I don't think they are. Here are the mod links if you want to check. https://www.beamng.com/resources/trial-mountain.285/ https://www.beamng.com/resources/rg-mega-motor-park.2956/ https://www.beamng.com/resources/road-atlanta-lidar-edition.3146/
First one is 4 years old and last updated 2 years ago. Second one is 3 years old and almost hasn't been updated at all since release. Same with the third one. Seriously why do people never check the dates??? If a mod is over a year old then there's practically a 90% chance it's completely broken and outdated beyond repair.