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Cycles particle motion blur spans over whole particle life (when not cached)
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System Information
Operating system: Linux Mint 19
Graphics card: Nvidia GK107 [GeForce GT 640] with driver : xf86-video-nouveau 1.0.15-2

Blender Version
Broken: 2.8 Date: 2018-12-16 23:25 Hash: 9149e894210

Worked: 2.79b

Short description of error
When a particle simulation is not cached, the Cycles motion blur uses the entire lifetime of all particles instead of a single frame

Exact steps for others to reproduce the error
This simple example file shows it very clearly:

Play the simulation and render. Then cache the simulation and re-render the same frame.



Event Timeline

Jacques Lucke (JacquesLucke) triaged this task as Confirmed, Medium priority.

I can reproduce it. I'm not sure how to handle that. Personally I'd not expect cycles motion blur to work when the particle system is not baked, but I don't know how it works.