How to reproduce:
1. Open attached project ("PS-REPRO.zip")
2. Open SampleScene scene
3. Select ParticleSystemPrefab Game object and modify it
4. Undo changes (CTRL-Z or Edit->Undo Inspector)
Expected result: ParticleSystemPrefab Game object continues to play
Actual result: ParticleSystemPrefab Game object stops playing
Reproducible with: 2017.4.35f1, 2018.4.15f1, 2019.2.17f1, 2019.3.0f3, 2020.1.0a17