How to reproduce:
1. Drag VFX to the Scene
2. Select VFX Graph in the Project window
3. Click ellipsis in the top-right corner > convert to floating window
4. Observe that effect is flickering or not playing at all
Reproduced with: 2022.2.0a6 (14.0.1)
Notes:
- When deleting effect from the scene it is also gone from the preview window
- When vfx is not in the scene vfx in a floating preview window is flickering