No smoke or dust.

I have the same issue (every game mode, track and car)... additionally I have problems with shadows with msaa on.
For a better performance in VR I turned shadows and car shadows off. I only wanted to have contact shadows.
But with MSAA it doesn't worked.

System:
- CPU: Ryzen 5 3600
- GPU: AMD RX 5700XT
- GPU-Driver: different (see below)
- OS: Windows 10 Pro 64
- Display: single, VR

Issue
(see below)

Where does the error appear:
single + multiplayer + ranked
all cars + tracks.

Reproduce:
After a lot of tests with gfx settings and gfx driver I found out:
The problem depends on the AMD GFX driver. With the Version 20.4.2 and older everything works fine. (But the game performance is not so good with the old driver). The problem starts with the driver version 20.5.1. I don't no was AMD has changed there.

For reproducing the problem here some gfx settings and the effects:
(MSAA OFF)
1. MSAA OFF AND
shadows ON AND
car shadows ON
contact shadows 1-32
=> smoke visible and shadows, car shadows and contact shadows visible

2. MSAA OFF AND
shadows ON AND
car shadows OFF
contact shadows 1-32
=> smoke visible and shadows and contact shadows visible and car shadows not visible

BUT
3. MSAA OFF AND
shadows OFF AND
car shadows ON
contact shadows 1-32
=> smoke visible and shadows not visible, contact shadows are visible
but car shadows not visible

(now MSAA ON)
4. MSAA ON (at least 2x) AND
shadows ON AND
car shadows ON
contact shadows 1-32
=> shadows, car shadows and contact shadows visible
but smoke not visible

5. MSAA ON (at least 2x) AND
shadows ON AND
car shadows OFF
contact shadows 1-32
=> shadows visible, car shadows not visible
but smoke not visible, contact shadows not visible

6. MSAA ON (at least 2x) AND
shadows OFF AND
car shadows ON
contact shadows 1-32
=> shadows not visible
but smoke not visible, car shadows not visible and contact shadows not visible

7. MSAA on (at least 2x) AND
shadows OFF AND
car shadows OFF
contact shadows 1-32
=> shadows not visible, car shadows not visible
but smoke not visible, contact shadows not visible

 

I have just noticed this too - My own car produces dust and smoke but I just watched a AI race at brands hatch with lots of incidents and the AI cars didnt produce smoke or dust

 

There is a new driver version for AMD graphics ... 21.3.1

Suddenly there are smoke and shadows with MSAA on.
It looks like AMD has fix some problems.

 

Is it me or is it only in replays smoke/dust doesnt appear?