Particle Systems using Mesh render mode with a trigger set to kill on exit will randomly explode vertices from the mesh while in edit mode. This can be observed in both the scene and game view.

Repro steps:
1. Open Bug_VisualArtefact scene from attached project.
2. Click on ParticleSystem within the hierarchy to start the particle system.
3. If artefact has not appeared yet, click away from ParticleSystem in the hierarchy and then click again on it.
4. Observe how occasionally vertices flicker across the screen.

Expected: no visual artefacts.

Notes:
- It's sometimes easier to see in the scene view by just rotating the view around the particle system.
- Reproducible in 5.4.0b1 and b2.
- Issue doesn't seem to appear in play mode.

(New feature introduced in 5.4.0b1, not a regression).