Flickering lens flares in art of rally

System information

System:
  Host: zoe Kernel: 5.8.0-2-amd64 x86_64 bits: 64 compiler: N/A 
  Desktop: GNOME 3.36.6 tk: GTK 3.24.23 wm: gnome-shell dm: GDM3 
  Distro: Debian GNU/Linux bullseye/sid 
CPU:
  Info: Quad Core model: Intel Core i5-6600 bits: 64 type: MCP 
  arch: Skylake-S rev: 3 L2 cache: 6144 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
  bogomips: 26399 
  Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800 
  3: 800 4: 800 
Graphics:
  Device-1: AMD Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] 
  vendor: XFX Pine driver: amdgpu v: kernel bus ID: 01:00.0 
  chip ID: 1002:67df 
  Display: x11 server: X.Org 1.20.9 compositor: gnome-shell 
  driver: amdgpu,ati unloaded: fbdev,modesetting,vesa 
  resolution: 1920x1080~60Hz s-dpi: 97 
  OpenGL: renderer: Radeon RX 570 Series (POLARIS10 DRM 3.38.0 5.8.0-2-amd64 
  LLVM 10.0.1) 
  v: 4.6 Mesa 20.1.8 direct render: Yes

Describe the issue

The Unity game art of rally suffers from large, flickering, lens flares during dark stages. This can be reproduced with the demo and the full version.

This happens when the game settings are set to medium or higher. Specifically to reproduce the settings must be:

quality - medium (or higher)
bloom - on
shadow distance - lowest (or higher) Antialias must be set to either smaa or fxaa, it does not happen when taa is used.

The rally stage must be set to night, fog or rain.

The game have some other issues with missing terrain fixed in 20.2+ but 20.1 should run the game and reproduce this specific issue.

Reproduced with 20.1.8 and 20.3.0-devel (git-90b98c06) on radeonsi.