Motion Blur not working Properly

Support Lighting and Rendering
1

Living 1Part
Living 1Part1216×522 661 KB

Motion Blur missing in few parts of Ceiling fan

Please anyone knows the solution

2

I thought that was something related to the wood ceiling, but motion blur is working fine here. Could be fan geometry, maybe edges are too thin.

mb_test
mb_test1919×1079 251 KB

Try this file, for testing purposes:
motion_blur_test.blend (2.2 MB)

3

Thank a lot, Will check it