aiMotionBlur aov not working when aiAthmosphere is on.

[theoSPVCF]

Hello, 

I've got a strange behavior.
Custom motion blur aov with aiMotionVector shader set to raw are not working when there is an ai atmosphere in the scene. 

I tried to assign directly the aiMotion vector to the object and it's working.
Default motion vector aov is also working.
The documentation mention a custom motion vector aov is needed for deformed geometry to work, is it still accurate ?
Maya 2022 - Arnold 7.1.4.3 
thks !

[theoSPVCF]

i'm back.
Cf the documentation, we should use a aiMotionVector shader when doing motion blur in compositing with deformed geomatry.
I tried the basic motion vector aov, and the result are looking okay.
Also the motion vector is still working when there is an aiAthmosphere.

My custom aimotionvector shader is looking similar but sometime the blur triple in intensity on random frame.

My plan is to only use the default motion AOV, but am I missing something ?