Anim Interface Implementation from Child AnimBP is not working

The licesee expects to have Anim Interface Implementation from the Child AnimBP override the behavior in Parent AnimBP, even calling link Anim Class Layers in BP to link the ChildAnimBP layers is not working. 

Please refer to the attached [Link Removed], open AnimLayer/TestMap and play

Result: The Mannequin is playing the idle animation as defined in the ParentAnimBP.

Expect Result: The Mannequin is playing the walking animation as defined in the ParentAnimBP_Child Simple layer.

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