Particle lifetime loss upon collision looks to be taking away too much lifetime.

Repro steps:
1. Open LifetimeLoss scene from attached project.
2. Press play.
3. Observe how the green particles (0.5 lifetime loss) gets killed off much earlier than the red ones (0 lifetime loss).

Expected outcome: green particles to loose half of the remaining time from the point of impact.
Actual result: lifetime loss seems to be much more substantial.

Notes:
- Possibly multiple collision calls?
- Not a regression, appears in Version 5.3.1f1