Hello
there is a bug on vertex motion blur together with a moving camera. not always vissible but on some objekts it occurs.
I´v found a fix for it that is maybe not that convinient in all situations but for now it works and saves our project.
Fix: to place a world space modifier on top of everything ie a point cache WSM. you don´t have to cache it just place it on top and it will fix the incorrect bluing on the object.
I post a file for you t view
Octane version: OctaneRender_for_3ds_Max_3.05.3_-_4.30 ( But I belive it´s the same in all later versions. )
Best
Daniel