hey QuickZ,

I know it's been almost a year since you made this post, but just wanted to share in case anyone you or anyone else may still be interested:

I have the same issue with zombies/vehicles on my server. I reached the same theory when a player of mine sent me a video of a zombie popping onto his Quad Bike and disappearing lol. Anyway, I've FINALLY started looking into this and I discovered the issue is caused by "RZ_fnc_NeutralizeVehicle" inside of ryanzombies.pbo > fn_preInit.sqf.

Looking at the function, it confirms both of our theories: it spawns an AI unit in the driver seat and then turns it invisible and deletes it. I think it has to do with making the Zombies target/attack vehicles? Not sure what it's purpose is...but it's definitely there.

I found this thread because I'm trying to see if there is any way to override the mod without having to make a new mod myself or something. If so, this can be very easily fixed I think. If not, I'll have to get super creative to try to fix it...if its even possible :(

I solved it shortly after by commenting out the part of the script that makes zombies attack vehicles. Indeed the mod adds invisible ai as drivers when to zombies attack them while empty.
I still had them swarm outside the car when you enter it with zombie aggro.

I also think kuplion addad a fix later on for exilez. Not sure though.
Things get added and removed for random reasons. :p #armamodding

Is this chsnge needed only on server side?
Could you post details what needs to be done exactly?