Yeah we've been working on an update for a while Also you must have missed this pop-up, and KLJP already has a thread for discussing the mod and reporting bugs
I believe after the last big update something with the AI Traffic Spawning Tool broke if you're using the World Editors Traffic Tool which was mentioned by AgentMooshroom5 on another thread. For as long as I've used the KLJP mod I've never seen the Facelift Sunburst version that's in the KLJP mod spawn in. I have also noticed that since the last big game update the Traffic AI has been rather.... stupid, to put it simply. You'll have to wait for the Updates for the game and these mods to come out that fixes the AI traffic issues and issues with the mods themselves. Hopefully a moderator or someone will lock this thread.
@K30N you can find a temporary solution here https://www.beamng.com/threads/simple-traffic-configs.100407/