A while ago I did some experimenting and discovered that it was only declining vehicles that had certain handling flags like "FLAG_HAS_INCREASED_RAMMING_FORCE". I haven't experimented with anything other than that one and the different ramming flags introduced in Import/Export, though.

@Reacon Originally I tried adding the Kamacho and the Dune FAV. Since those didn't work, I tried experimenting with different vehicles. The only vehicles that the game would accept had working lightbars and sirens.

At this point, the only thing I can think of is that it'll only accept vehicles with police sirens. I just replaced every vehicle with the Police Transporter, and the Sheriff Stanier. This has been the only combination that has worked.

EDIT: Firetruck, RCV, and Riot refuse to spawn even though they have police sirens.

This is especially strange since I've seen far more complex dispatch configurations that work. Hell, a few months ago I replaced all of the law enforcement vehicles with Brickades and it still worked. Don't know why it's different now

Nope. Haven't messed with any of those things.

I tried modifying dispatch.meta to change what police vehicles spawn. All vehicles that normally chase you down have no drivers in them, and the only things that seem to work correctly are roadblocks, and police helicopters. All I did was swap out Interceptor for the Kamacho, the Sheriff Staniers for the Dune FAV, the Police Maverick for the Buzzard, and swapped out every cop and SWAT model with a modified version of S_F_Y_COP_01 to give the appearance that everyone is a clone like in Doomsday Heist. I'm using no add-on vehicles or peds, and the S_F_Y_COP_01 model was swapped with an epsilon cultist model straight out of the game.

I have looked far and wide for a solution. I tried DispatchGhostFix and carefully followed the instructions. Didn't work even if I had 10 instances of the script running at once. No matter what, the pursuit vehicles refused to spawn with a driver. I searched google and these forums. The only relevant results either had no answers and one guy giving up. I only found one person who got it working and their grammar was unreadable. I refuse to give up on this.