Unity Issue Tracker - Random Number Operator in a child System only has set limited seeds for particle spawning in a visual effect when entering the Play Mode

2022.2.X

2022.2.9f1 onwards

6.2.X

6.1.X

6.0.X

2022.3.X

Implementation of the workaround for this issue is too complex and risky. Not worth backporting for an issue this specific.

How to reproduce:
1. Open the “VFXReproRandom“ project
2. Open the “Test“ scene
3. Enter the Play Mode
4. Observe the Game view

Expected result: Particles are being spawned randomly all over
Actual result: Particles are being spawned only in a few spots

Reproducible with: 2022.2.9f1, 2022.3.37f1, 6000.0.10f1
Not reproducible with: 2021.3.40f1, 2022.2.8f1

Reproducible on:

Not reproducible on:

Notes:

Only reproducible on Silicon
Not reproducible in the Player
Not reproducible in the Edit Mode
Workaround: If you navigate to the Visual Effect Graph window (for the “VFX“ visual effect), open the VFX Control panel during the Play Mode, then set the Debug mode to Efficiency or Alive the issue does not reproduce anymore

Random Number Operator in a child System only has set limited seeds for particle spawning in a visual effect when entering the Play Mode