Recently, police vehicles won't despawn when I drive away.

 

For example, while I'm in a pursuit and I call for additional units, after the pursuit ends, the AI police vehicles will just stay there - often blocking the road and won't despawn when I drive away and come back.

 

Anyone have a similar issue and/or a possible fix to this?

I have this issue on a completely un-modded version of lspdfr. I've found an fix on google once before that involved the use of a ragepluginhook command that cleared all the cars but i cannot remember what it is. I know that is not helpful to you but i figured i'd let you know there is a fix.

Try this: push F4 and type CleanWorld  in the console

This will despawn everything like cars and pedestrians and can also fix another issue where after a hour or so of playing the game drivers become invisible.