The sun texture gets distorted when brightness > 2 and there's Atmosphere instance

I use the old sky texture. The issue is much less visible on the new default sun.
The brightness in my game is set to 3, and it worked just fine until I added atmosphere instance (for the new fog).
This is what happened:


The problem almost disappears when I lower the Lighting.Brightness and is even more noticeable at higher brightness.
I checked all other Lighting/Atmosphere/Sky/ColorCorrection settings and nothing but Brightness affects the sun texture.

System information:

CPU Intel(R) Core(TM) i5-7300HQ CPU @ 2.50GHz
Base speed:	2,50 GHz
Sockets:	1
Cores:	4
Logical processors:	4
Virtualization:	Enabled
L1 cache:		256 KB
L2 cache:	1,0 MB
L3 cache:	6,0 MB
Utilization	18%
Speed	3,17 GHz
Up time	7:11:28:35
Processes	208
Threads	2625
Handles	99081
Memory 24,0 GB
Speed:	2400 MHz
Slots used:	2 of 2
Form factor:	SODIMM
Hardware reserved:	113 MB

Available	11,9 GB
Cached	7,2 GB
Committed	13,7/27,4 GB
Paged pool	698 MB
Non-paged pool	404 MB
In use (Compressed)	11,8 GB (779 MB)
GPU 0 GPU 0
Intel(R) HD Graphics 630

Driver version:	31.0.101.2111
Driver date:	19.07.2022
DirectX version:	12 (FL 12.1)
Physical location:	PCI bus 0, device 2, function 0

Utilization	6%
Dedicated GPU memory	0,7/4,0 GB
Shared GPU memory	0,3/11,9 GB
GPU Memory	0,3/11,9 GB
GPU 1 GPU 1
NVIDIA GeForce GTX 1050

Driver version:	31.0.15.3667
Driver date:	12.07.2023
DirectX version:	12 (FL 12.1)
Physical location:	PCI bus 1, device 0, function 0

Utilization	7%
Dedicated GPU memory	0,7/4,0 GB
Shared GPU memory	0,0/11,9 GB
GPU Memory	0,7/15,9 GB

Reproduction file:
skybug.rbxl (56.3 KB)

Expected behavior

This is what the sun looks like when I only remove the atmosphere instance, without changing any other settings:

Without Atmosphere, the Lighting.Brightness doesn’t affect sun texture at all and I didn’t expect this behavior to change once Atmosphere is added.