Reproduction steps:
1.Open the project
2.Open and play "Assets -> Walking Robot -> Scenes -> Walking Robot" scene
3.Press and hold w as soon as the game starts.
- You should see the visual artifacts created by Trail Renderer(Check the attached pictures)
4.Align your camera with the horizon
5.First, press w, so the character starts walking, and then hold w+a to move in circles
- You should see the visual artifacts

Expected results:
Trail looks the same from any angle.

Actual results:
The trail is flickering and creating visual artifacts

Reproduced with:
5.5.0a6, 5.5.0b1, 5.5.0b2, 5.5.0b3, 5.5.0b4

Couldn't reproduce with older versions, because Trail Renderer introduced new features on 5.5 version of Unity