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Camera motion blur bug
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows 10
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66

Blender Version
Blender 2.81a

Short description of error
When you change the number of motion blur steps more than 1 for camera, it starts to work incorrectly

Cycles 1 steps

Cycles 3 steps

Cycles 8 steps

Luxcore renderer 50 steps (in luxcore number of steps does not multiply, therefore such a large number)

.blend

Luxcore result looks much more accurate to me.
I also found some strange problem when I made camera object parent of 3D text, but I will talk about it later if necessary.

Event Timeline

Andrey (DEBIHOOD) changed the task status from Needs Triage to Needs Developer to Reproduce.Sat, Jan 4, 6:54 PM
Andrey (DEBIHOOD) added a project: Cycles.
Andrey (DEBIHOOD) changed the task status from Needs Developer to Reproduce to Needs Triage.Mon, Jan 13, 10:36 AM
Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.EditedMon, Jan 13, 12:33 PM
Philipp Oeser (lichtwerk) changed the subtype of this task from "Report" to "Bug".

Can confirm, checking...

This is working fine for moving objects:

Should be working (rB78c2063), so assume this is a bug...

EDIT: rB78c2063 might not be related in the end, still, report looks like a bug