engineImageLinkDFF issue

[Xenius97]

Describe the bug

Some vehicle model replacement isn't working properly.
When you spawn in the game, these vehicles will have default GTA:SA models.
After going far away, and going back it will be modded vehicle again.
I've found these id's only have this issue: 596, 597, 598 (police cars)

https://streamable.com/2hlxey
https://streamable.com/0s9v4b

Steps to reproduce

Replace 596, restart mta
Then connect to server
Used model:
596.zip

Version

Multi Theft Auto v1.6-release-21956

Additional context

No response

Relevant log output

No response

Security Policy

• I have read and understood the Security Policy and this issue is not security related.

[Meine1]

I encountered the same issue but with some skin model IDs, mainly 280, 60, 58, 44, 22, 17, 13, and 7 , might be related #3032

[Pirulax]

Police cars are cached on a per-region [eg LS, SF, LV] basis, and so are gang vehicles [and maybe even gang ped models].
It is possible that engineRestreamWorld() doesn't actually unload those models.
The function CStreaming::RemoveLoadedVehicle() is responsible for removing these models.
Now, the cop cars and peds for a specific zone are made STREAMING_GAME_REQUIRED in CStreaming::StreamCopModels(eLevelName level).
I believe simply disabling these functions [as they simply exist for optimization purposes - as in, faster load times on CD, reducing pop-in] should solve the problem.