Steps to reproduce:

1. Download and import attached project.
2. Open scene: Test
3. Press play.

Expected result: Both particles start at the same time.
Actual result: Right particle system (Flame1) starts 2 seconds later, even when prewarm is checked.

Notes: If start lifetime is greater than start delay everything works fine. Start delay is disabled because of prewarm, but the value entered before still alters the simulation. (PNG)

Reproduced on: 5.4.0b12, 5.3.4f1, 5.2.4f1